51111155 has 4 divisors (see below), whose sum is σ = 61333392. Its totient is φ = 40888920.

The previous prime is 51111149. The next prime is 51111161. The reversal of 51111155 is 55111115.

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

It is an interprime number because it is at equal distance from previous prime (51111149) and next prime (51111161).

It is not a de Polignac number, because 51111155 - 2⁴ = 51111139 is a prime.

It is a super-2 number, since 2×51111155² = 5224700330868050, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5111111 + ... + 5111120.

It is an arithmetic number, because the mean of its divisors is an integer number (15333348).

Almost surely, 2^51111155 is an apocalyptic number.

51111155 is a deficient number, since it is larger than the sum of its proper divisors (10222237).

51111155 is a wasteful number, since it uses less digits than its factorization.

51111155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10222236.

The product of its digits is 125, while the sum is 20.

The square root of 51111155 is about 7149.2065993367. The cubic root of 51111155 is about 371.1122000644.

The spelling of 51111155 in words is "fifty-one million, one hundred eleven thousand, one hundred fifty-five".