155677491 has 8 divisors (see below), whose sum is σ = 230633360. Its totient is φ = 103784976.

The previous prime is 155677471. The next prime is 155677499. The reversal of 155677491 is 194776551.

155677491 is a `hidden beast` number, since 1 + 556 + 7 + 7 + 4 + 91 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-155677491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155677499) 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, 2882890 + ... + 2882943.

It is an arithmetic number, because the mean of its divisors is an integer number (28829170).

Almost surely, 2^155677491 is an apocalyptic number.

155677491 is a deficient number, since it is larger than the sum of its proper divisors (74955869).

155677491 is an equidigital number, since it uses as much as digits as its factorization.

155677491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5765842 (or 5765836 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 155677491 is about 12477.0786244217. The cubic root of 155677491 is about 537.9500363582.

The spelling of 155677491 in words is "one hundred fifty-five million, six hundred seventy-seven thousand, four hundred ninety-one".