145507243 has 4 divisors (see below), whose sum is σ = 166294000. Its totient is φ = 124720488.

The previous prime is 145507231. The next prime is 145507247. The reversal of 145507243 is 342705541.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145507243 is a prime.

It is a super-2 number, since 2×145507243² = 42344715530922098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145507247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10393368 + ... + 10393381.

It is an arithmetic number, because the mean of its divisors is an integer number (41573500).

Almost surely, 2^145507243 is an apocalyptic number.

145507243 is a deficient number, since it is larger than the sum of its proper divisors (20786757).

145507243 is an equidigital number, since it uses as much as digits as its factorization.

145507243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20786756.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 145507243 is about 12062.6383100879. The cubic root of 145507243 is about 525.9706824875.

The spelling of 145507243 in words is "one hundred forty-five million, five hundred seven thousand, two hundred forty-three".