51899534 has 4 divisors (see below), whose sum is σ = 77849304. Its totient is φ = 25949766.

The previous prime is 51899513. The next prime is 51899539. The reversal of 51899534 is 43599815.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51899539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12974882 + ... + 12974885.

It is an arithmetic number, because the mean of its divisors is an integer number (19462326).

Almost surely, 2^51899534 is an apocalyptic number.

51899534 is a deficient number, since it is larger than the sum of its proper divisors (25949770).

51899534 is a wasteful number, since it uses less digits than its factorization.

51899534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25949769.

The product of its digits is 194400, while the sum is 44.

The square root of 51899534 is about 7204.1331192587. The cubic root of 51899534 is about 373.0105822047.

The spelling of 51899534 in words is "fifty-one million, eight hundred ninety-nine thousand, five hundred thirty-four".