51499081 has 4 divisors (see below), whose sum is σ = 52267792. Its totient is φ = 50730372.

The previous prime is 51499057. The next prime is 51499087. The reversal of 51499081 is 18099415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18099415 = 5 ⋅3619883.

It is a cyclic number.

It is not a de Polignac number, because 51499081 - 2²¹ = 49401929 is a prime.

It is a super-2 number, since 2×51499081² = 5304310687689122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51499081.

It is not an unprimeable number, because it can be changed into a prime (51499087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384255 + ... + 384388.

It is an arithmetic number, because the mean of its divisors is an integer number (13066948).

Almost surely, 2^51499081 is an apocalyptic number.

It is an amenable number.

51499081 is a deficient number, since it is larger than the sum of its proper divisors (768711).

51499081 is an equidigital number, since it uses as much as digits as its factorization.

51499081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768710.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 51499081 is about 7176.2860171540. The cubic root of 51499081 is about 372.0487299828.

The spelling of 51499081 in words is "fifty-one million, four hundred ninety-nine thousand, eighty-one".