155116591 has 32 divisors (see below), whose sum is σ = 190513152. Its totient is φ = 123504480.

The previous prime is 155116583. The next prime is 155116603. The reversal of 155116591 is 195611551.

It is a cyclic number.

It is not a de Polignac number, because 155116591 - 2³ = 155116583 is a prime.

It is a super-2 number, since 2×155116591² = 48122313606922562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155116541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 683220 + ... + 683446.

It is an arithmetic number, because the mean of its divisors is an integer number (5953536).

Almost surely, 2^155116591 is an apocalyptic number.

155116591 is a deficient number, since it is larger than the sum of its proper divisors (35396561).

155116591 is a wasteful number, since it uses less digits than its factorization.

155116591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379.

The product of its digits is 6750, while the sum is 34.

The square root of 155116591 is about 12454.5811250319. The cubic root of 155116591 is about 537.3031877958.

The spelling of 155116591 in words is "one hundred fifty-five million, one hundred sixteen thousand, five hundred ninety-one".