155972697 has 8 divisors (see below), whose sum is σ = 208554144. Its totient is φ = 103686528.

The previous prime is 155972689. The next prime is 155972731. The reversal of 155972697 is 796279551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155972697 - 2³ = 155972689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155972627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72583 + ... + 74700.

It is an arithmetic number, because the mean of its divisors is an integer number (26069268).

Almost surely, 2^155972697 is an apocalyptic number.

It is an amenable number.

155972697 is a deficient number, since it is larger than the sum of its proper divisors (52581447).

155972697 is a wasteful number, since it uses less digits than its factorization.

155972697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147639.

The product of its digits is 1190700, while the sum is 51.

The square root of 155972697 is about 12488.9029542230. The cubic root of 155972697 is about 538.2898538520.

The spelling of 155972697 in words is "one hundred fifty-five million, nine hundred seventy-two thousand, six hundred ninety-seven".