155291992 has 8 divisors (see below), whose sum is σ = 291172500. Its totient is φ = 77645992.

The previous prime is 155291971. The next prime is 155292001. The reversal of 155291992 is 299192551.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9705742 + ... + 9705757.

Almost surely, 2^155291992 is an apocalyptic number.

It is an amenable number.

155291992 is a deficient number, since it is larger than the sum of its proper divisors (135880508).

155291992 is a wasteful number, since it uses less digits than its factorization.

155291992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19411505 (or 19411501 counting only the distinct ones).

The product of its digits is 72900, while the sum is 43.

The square root of 155291992 is about 12461.6207613617. The cubic root of 155291992 is about 537.5056334005.

The spelling of 155291992 in words is "one hundred fifty-five million, two hundred ninety-one thousand, nine hundred ninety-two".