155973122 has 6 divisors (see below), whose sum is σ = 233986179. Its totient is φ = 77977730.

The previous prime is 155973101. The next prime is 155973127. The reversal of 155973122 is 221379551.

It can be written as a sum of positive squares in only one way, i.e., 77986561 + 77986561 = 8831^2 + 8831^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8831.

It is a super-2 number, since 2×155973122² = 48655229572853768, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155973127) 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 2 ways as a sum of consecutive naturals, for example, 13247 + ... + 22077.

Almost surely, 2^155973122 is an apocalyptic number.

155973122 is a deficient number, since it is larger than the sum of its proper divisors (78013057).

155973122 is an frugal number, since it uses more digits than its factorization.

155973122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17664 (or 8833 counting only the distinct ones).

The product of its digits is 18900, while the sum is 35.

The square root of 155973122 is about 12488.9199693168. The cubic root of 155973122 is about 538.2903427687.

The spelling of 155973122 in words is "one hundred fifty-five million, nine hundred seventy-three thousand, one hundred twenty-two".