55115331 has 4 divisors (see below), whose sum is σ = 73487112. Its totient is φ = 36743552.

The previous prime is 55115329. The next prime is 55115363. The reversal of 55115331 is 13351155.

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 55115331 - 2¹ = 55115329 is a prime.

It is a super-2 number, since 2×55115331² = 6075399422479122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55115131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9185886 + ... + 9185891.

It is an arithmetic number, because the mean of its divisors is an integer number (18371778).

Almost surely, 2^55115331 is an apocalyptic number.

55115331 is a deficient number, since it is larger than the sum of its proper divisors (18371781).

55115331 is a wasteful number, since it uses less digits than its factorization.

55115331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18371780.

The product of its digits is 1125, while the sum is 24.

The square root of 55115331 is about 7423.9700295731. The cubic root of 55115331 is about 380.5608776503.

Adding to 55115331 its reverse (13351155), we get a palindrome (68466486).

The spelling of 55115331 in words is "fifty-five million, one hundred fifteen thousand, three hundred thirty-one".