155116491 has 4 divisors (see below), whose sum is σ = 206821992. Its totient is φ = 103410992.

The previous prime is 155116477. The next prime is 155116499. The reversal of 155116491 is 194611551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155116491 - 2⁶ = 155116427 is a prime.

It is a super-2 number, since 2×155116491² = 48122251560306162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155116499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25852746 + ... + 25852751.

It is an arithmetic number, because the mean of its divisors is an integer number (51705498).

Almost surely, 2^155116491 is an apocalyptic number.

155116491 is a deficient number, since it is larger than the sum of its proper divisors (51705501).

155116491 is an equidigital number, since it uses as much as digits as its factorization.

155116491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51705500.

The product of its digits is 5400, while the sum is 33.

The square root of 155116491 is about 12454.5771104442. The cubic root of 155116491 is about 537.3030723335.

The spelling of 155116491 in words is "one hundred fifty-five million, one hundred sixteen thousand, four hundred ninety-one".