51099520 has 32 divisors (see below), whose sum is σ = 122161320. Its totient is φ = 20439552.

The previous prime is 51099497. The next prime is 51099539. The reversal of 51099520 is 2599015.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×51099520² = 5222321888460800, which contains 22 as substring.

It is a congruent 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, 39282 + ... + 40561.

Almost surely, 2^51099520 is an apocalyptic number.

It is an amenable number.

51099520 is an abundant number, since it is smaller than the sum of its proper divisors (71061800).

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

51099520 is an equidigital number, since it uses as much as digits as its factorization.

51099520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79862 (or 79850 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 51099520 is about 7148.3928263631. The cubic root of 51099520 is about 371.0840377964.

The spelling of 51099520 in words is "fifty-one million, ninety-nine thousand, five hundred twenty".