51813922 has 4 divisors (see below), whose sum is σ = 77720886. Its totient is φ = 25906960.

The previous prime is 51813911. The next prime is 51813929. The reversal of 51813922 is 22931815.

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

It can be written as a sum of positive squares in only one way, i.e., 50253921 + 1560001 = 7089^2 + 1249^2 .

It is not an unprimeable number, because it can be changed into a prime (51813929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12953479 + ... + 12953482.

Almost surely, 2^51813922 is an apocalyptic number.

51813922 is a deficient number, since it is larger than the sum of its proper divisors (25906964).

51813922 is a wasteful number, since it uses less digits than its factorization.

51813922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25906963.

The product of its digits is 4320, while the sum is 31.

The square root of 51813922 is about 7198.1887999691. The cubic root of 51813922 is about 372.8053667635.

The spelling of 51813922 in words is "fifty-one million, eight hundred thirteen thousand, nine hundred twenty-two".