155022561 has 6 divisors (see below), whose sum is σ = 223921490. Its totient is φ = 103348368.

The previous prime is 155022557. The next prime is 155022583. The reversal of 155022561 is 165220551.

It can be written as a sum of positive squares in only one way, i.e., 142062561 + 12960000 = 11919^2 + 3600^2 .

It is not a de Polignac number, because 155022561 - 2² = 155022557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155022521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8612356 + ... + 8612373.

Almost surely, 2^155022561 is an apocalyptic number.

It is an amenable number.

155022561 is a deficient number, since it is larger than the sum of its proper divisors (68898929).

155022561 is a wasteful number, since it uses less digits than its factorization.

155022561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17224735 (or 17224732 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 155022561 is about 12450.8056365843. The cubic root of 155022561 is about 537.1945967233.

The spelling of 155022561 in words is "one hundred fifty-five million, twenty-two thousand, five hundred sixty-one".