145505537 has 4 divisors (see below), whose sum is σ = 150199296. Its totient is φ = 140811780.

The previous prime is 145505531. The next prime is 145505543. The reversal of 145505537 is 735505541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 735505541 = 499 ⋅1473959.

It is an interprime number because it is at equal distance from previous prime (145505531) and next prime (145505543).

It is a cyclic number.

It is not a de Polignac number, because 145505537 - 2⁶ = 145505473 is a prime.

It is a super-2 number, since 2×145505537² = 42343722595316738, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145505497 and 145505506.

It is not an unprimeable number, because it can be changed into a prime (145505531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2346833 + ... + 2346894.

It is an arithmetic number, because the mean of its divisors is an integer number (37549824).

Almost surely, 2^145505537 is an apocalyptic number.

It is an amenable number.

145505537 is a deficient number, since it is larger than the sum of its proper divisors (4693759).

145505537 is an equidigital number, since it uses as much as digits as its factorization.

145505537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4693758.

The product of its (nonzero) digits is 52500, while the sum is 35.

The square root of 145505537 is about 12062.5675956655. The cubic root of 145505537 is about 525.9686268979.

The spelling of 145505537 in words is "one hundred forty-five million, five hundred five thousand, five hundred thirty-seven".