51620901 has 16 divisors (see below), whose sum is σ = 72316800. Its totient is φ = 32690240.

The previous prime is 51620897. The next prime is 51620903. The reversal of 51620901 is 10902615.

It is a cyclic number.

It is not a de Polignac number, because 51620901 - 2² = 51620897 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51620903) 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, 7771 + ... + 12791.

It is an arithmetic number, because the mean of its divisors is an integer number (4519800).

Almost surely, 2^51620901 is an apocalyptic number.

It is an amenable number.

51620901 is a deficient number, since it is larger than the sum of its proper divisors (20695899).

51620901 is a wasteful number, since it uses less digits than its factorization.

51620901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5196.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 51620901 is about 7184.7686810363. The cubic root of 51620901 is about 372.3418568079.

The spelling of 51620901 in words is "fifty-one million, six hundred twenty thousand, nine hundred one".