145561257 has 12 divisors (see below), whose sum is σ = 210462720. Its totient is φ = 96945048.

The previous prime is 145561231. The next prime is 145561279. The reversal of 145561257 is 752165541.

145561257 is a `hidden beast` number, since 1 + 45 + 561 + 2 + 57 = 666.

It is not a de Polignac number, because 145561257 - 2¹² = 145557161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145561057) 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 11 ways as a sum of consecutive naturals, for example, 2344 + ... + 17222.

It is an arithmetic number, because the mean of its divisors is an integer number (17538560).

Almost surely, 2^145561257 is an apocalyptic number.

It is an amenable number.

145561257 is a deficient number, since it is larger than the sum of its proper divisors (64901463).

145561257 is a wasteful number, since it uses less digits than its factorization.

145561257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15972 (or 15969 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 145561257 is about 12064.8769989586. The cubic root of 145561257 is about 526.0357566039.

The spelling of 145561257 in words is "one hundred forty-five million, five hundred sixty-one thousand, two hundred fifty-seven".