51351690 has 32 divisors (see below), whose sum is σ = 132725376. Its totient is φ = 12640320.

The previous prime is 51351649. The next prime is 51351731. The reversal of 51351690 is 9615315.

It is an interprime number because it is at equal distance from previous prime (51351649) and next prime (51351731).

It is a super-2 number, since 2×51351690² = 5273992131712200, 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65446 + ... + 66225.

It is an arithmetic number, because the mean of its divisors is an integer number (4147668).

Almost surely, 2^51351690 is an apocalyptic number.

51351690 is an abundant number, since it is smaller than the sum of its proper divisors (81373686).

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

51351690 is a wasteful number, since it uses less digits than its factorization.

51351690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131694.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 51351690 is about 7166.0093497009. The cubic root of 51351690 is about 371.6934548270.

The spelling of 51351690 in words is "fifty-one million, three hundred fifty-one thousand, six hundred ninety".