51621325 has 12 divisors (see below), whose sum is σ = 73155040. Its totient is φ = 35397360.

The previous prime is 51621319. The next prime is 51621329. The reversal of 51621325 is 52312615.

It is not a de Polignac number, because 51621325 - 2⁹ = 51620813 is a prime.

It is a super-2 number, since 2×51621325² = 5329522389511250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 51621325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51621329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147315 + ... + 147664.

Almost surely, 2^51621325 is an apocalyptic number.

It is an amenable number.

51621325 is a deficient number, since it is larger than the sum of its proper divisors (21533715).

51621325 is a wasteful number, since it uses less digits than its factorization.

51621325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294996 (or 294991 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 51621325 is about 7184.7981878408. The cubic root of 51621325 is about 372.3428762432.

The spelling of 51621325 in words is "fifty-one million, six hundred twenty-one thousand, three hundred twenty-five".