145331556 has 12 divisors (see below), whose sum is σ = 339106992. Its totient is φ = 48443848.

The previous prime is 145331507. The next prime is 145331569. The reversal of 145331556 is 655133541.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×145331556² = 42242522338762272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6055470 + ... + 6055493.

It is an arithmetic number, because the mean of its divisors is an integer number (28258916).

Almost surely, 2^145331556 is an apocalyptic number.

It is an amenable number.

145331556 is an abundant number, since it is smaller than the sum of its proper divisors (193775436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145331556 is a wasteful number, since it uses less digits than its factorization.

145331556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12110970 (or 12110968 counting only the distinct ones).

The product of its digits is 27000, while the sum is 33.

The square root of 145331556 is about 12055.3538313896. The cubic root of 145331556 is about 525.7589096916.

The spelling of 145331556 in words is "one hundred forty-five million, three hundred thirty-one thousand, five hundred fifty-six".