51523699 has 4 divisors (see below), whose sum is σ = 51556240. Its totient is φ = 51491160.

The previous prime is 51523673. The next prime is 51523709. The reversal of 51523699 is 99632515.

It is a happy number.

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 51523699 - 2⁹ = 51523187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51523639) 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, 13767 + ... + 17104.

It is an arithmetic number, because the mean of its divisors is an integer number (12889060).

Almost surely, 2^51523699 is an apocalyptic number.

51523699 is a deficient number, since it is larger than the sum of its proper divisors (32541).

51523699 is a wasteful number, since it uses less digits than its factorization.

51523699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32540.

The product of its digits is 72900, while the sum is 40.

The square root of 51523699 is about 7178.0010448592. The cubic root of 51523699 is about 372.1080037692.

The spelling of 51523699 in words is "fifty-one million, five hundred twenty-three thousand, six hundred ninety-nine".