51099690 has 16 divisors (see below), whose sum is σ = 122639328. Its totient is φ = 13626576.

The previous prime is 51099689. The next prime is 51099691. The reversal of 51099690 is 9699015.

It is an interprime number because it is at equal distance from previous prime (51099689) and next prime (51099691).

It is a super-2 number, since 2×51099690² = 5222356636192200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51099691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 851632 + ... + 851691.

It is an arithmetic number, because the mean of its divisors is an integer number (7664958).

Almost surely, 2^51099690 is an apocalyptic number.

51099690 is an abundant number, since it is smaller than the sum of its proper divisors (71539638).

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

51099690 is a wasteful number, since it uses less digits than its factorization.

51099690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703333.

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 51099690 is about 7148.4047171379. The cubic root of 51099690 is about 371.0844493085.

The spelling of 51099690 in words is "fifty-one million, ninety-nine thousand, six hundred ninety".