145537447 has 4 divisors (see below), whose sum is σ = 158768136. Its totient is φ = 132306760.

The previous prime is 145537439. The next prime is 145537477. The reversal of 145537447 is 744735541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 145537447 - 2³ = 145537439 is a prime.

It is a super-2 number, since 2×145537447² = 42362296958555618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145537477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6615328 + ... + 6615349.

It is an arithmetic number, because the mean of its divisors is an integer number (39692034).

Almost surely, 2^145537447 is an apocalyptic number.

145537447 is a deficient number, since it is larger than the sum of its proper divisors (13230689).

145537447 is a wasteful number, since it uses less digits than its factorization.

145537447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13230688.

The product of its digits is 235200, while the sum is 40.

The square root of 145537447 is about 12063.8902100442. The cubic root of 145537447 is about 526.0070731602.

The spelling of 145537447 in words is "one hundred forty-five million, five hundred thirty-seven thousand, four hundred forty-seven".