155557971 has 12 divisors (see below), whose sum is σ = 224803072. Its totient is φ = 103655376.

The previous prime is 155557957. The next prime is 155558009. The reversal of 155557971 is 179755551.

155557971 is a `hidden beast` number, since 1 + 5 + 5 + 5 + 579 + 71 = 666.

It is not a de Polignac number, because 155557971 - 2²⁷ = 21340243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155557951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33525 + ... + 37881.

Almost surely, 2^155557971 is an apocalyptic number.

155557971 is a deficient number, since it is larger than the sum of its proper divisors (69245101).

155557971 is a wasteful number, since it uses less digits than its factorization.

155557971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8330 (or 8327 counting only the distinct ones).

The product of its digits is 275625, while the sum is 45.

The square root of 155557971 is about 12472.2881220729. The cubic root of 155557971 is about 537.8123323371.

The spelling of 155557971 in words is "one hundred fifty-five million, five hundred fifty-seven thousand, nine hundred seventy-one".