155870491 has 8 divisors (see below), whose sum is σ = 178458624. Its totient is φ = 133362600.

The previous prime is 155870483. The next prime is 155870513. The reversal of 155870491 is 194078551.

It is a happy number.

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

It is not a de Polignac number, because 155870491 - 2³ = 155870483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155870411) 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 7 ways as a sum of consecutive naturals, for example, 15835 + ... + 23716.

It is an arithmetic number, because the mean of its divisors is an integer number (22307328).

Almost surely, 2^155870491 is an apocalyptic number.

155870491 is a deficient number, since it is larger than the sum of its proper divisors (22588133).

155870491 is an equidigital number, since it uses as much as digits as its factorization.

155870491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40121.

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 155870491 is about 12484.8104110555. The cubic root of 155870491 is about 538.1722510593.

The spelling of 155870491 in words is "one hundred fifty-five million, eight hundred seventy thousand, four hundred ninety-one".