51117690 has 32 divisors (see below), whose sum is σ = 132120576. Its totient is φ = 12582720.

The previous prime is 51117679. The next prime is 51117701. The reversal of 51117690 is 9671115.

It is an interprime number because it is at equal distance from previous prime (51117679) and next prime (51117701).

It is a super-2 number, since 2×51117690² = 5226036461872200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 65146 + ... + 65925.

It is an arithmetic number, because the mean of its divisors is an integer number (4128768).

Almost surely, 2^51117690 is an apocalyptic number.

51117690 is an abundant number, since it is smaller than the sum of its proper divisors (81002886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51117690 is a wasteful number, since it uses less digits than its factorization.

51117690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131094.

The product of its (nonzero) digits is 1890, while the sum is 30.

The square root of 51117690 is about 7149.6636284513. The cubic root of 51117690 is about 371.1280160174.

The spelling of 51117690 in words is "fifty-one million, one hundred seventeen thousand, six hundred ninety".