51499651 has 4 divisors (see below), whose sum is σ = 58856752. Its totient is φ = 44142552.

The previous prime is 51499631. The next prime is 51499661. The reversal of 51499651 is 15699415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51499651 - 2¹³ = 51491459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51499601) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3678540 + ... + 3678553.

It is an arithmetic number, because the mean of its divisors is an integer number (14714188).

Almost surely, 2^51499651 is an apocalyptic number.

51499651 is a deficient number, since it is larger than the sum of its proper divisors (7357101).

51499651 is an equidigital number, since it uses as much as digits as its factorization.

51499651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7357100.

The product of its digits is 48600, while the sum is 40.

The square root of 51499651 is about 7176.3257311803. The cubic root of 51499651 is about 372.0501026092.

The spelling of 51499651 in words is "fifty-one million, four hundred ninety-nine thousand, six hundred fifty-one".