145520631 has 20 divisors (see below), whose sum is σ = 218786392. Its totient is φ = 96387408.

The previous prime is 145520623. The next prime is 145520633. The reversal of 145520631 is 136025541.

145520631 is a `hidden beast` number, since 1 + 4 + 5 + 5 + 20 + 631 = 666.

It is not a de Polignac number, because 145520631 - 2³ = 145520623 is a prime.

It is a super-2 number, since 2×145520631² = 42352508093276322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145520595 and 145520604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145520633) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6996 + ... + 18438.

Almost surely, 2^145520631 is an apocalyptic number.

145520631 is a deficient number, since it is larger than the sum of its proper divisors (73265761).

145520631 is a wasteful number, since it uses less digits than its factorization.

145520631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11612 (or 11603 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 145520631 is about 12063.1932339659. The cubic root of 145520631 is about 525.9868133673.

The spelling of 145520631 in words is "one hundred forty-five million, five hundred twenty thousand, six hundred thirty-one".