51621593 has 2 divisors, whose sum is σ = 51621594. Its totient is φ = 51621592.

The previous prime is 51621589. The next prime is 51621617. The reversal of 51621593 is 39512615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45535504 + 6086089 = 6748^2 + 2467^2 .

It is a cyclic number.

It is not a de Polignac number, because 51621593 - 2² = 51621589 is a prime.

It is not a weakly prime, because it can be changed into another prime (51621553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25810796 + 25810797.

It is an arithmetic number, because the mean of its divisors is an integer number (25810797).

Almost surely, 2^51621593 is an apocalyptic number.

It is an amenable number.

51621593 is a deficient number, since it is larger than the sum of its proper divisors (1).

51621593 is an equidigital number, since it uses as much as digits as its factorization.

51621593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 32.

The square root of 51621593 is about 7184.8168383056. The cubic root of 51621593 is about 372.3435206004.

The spelling of 51621593 in words is "fifty-one million, six hundred twenty-one thousand, five hundred ninety-three".