51621339 has 16 divisors (see below), whose sum is σ = 85812480. Its totient is φ = 26816160.

The previous prime is 51621329. The next prime is 51621341. The reversal of 51621339 is 93312615.

It is not a de Polignac number, because 51621339 - 2⁵ = 51621307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51621319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111504 + ... + 111965.

It is an arithmetic number, because the mean of its divisors is an integer number (5363280).

Almost surely, 2^51621339 is an apocalyptic number.

51621339 is a deficient number, since it is larger than the sum of its proper divisors (34191141).

51621339 is a wasteful number, since it uses less digits than its factorization.

51621339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223490.

The product of its digits is 4860, while the sum is 30.

The square root of 51621339 is about 7184.7991621200. The cubic root of 51621339 is about 372.3429099037.

The spelling of 51621339 in words is "fifty-one million, six hundred twenty-one thousand, three hundred thirty-nine".