51693553 has 2 divisors, whose sum is σ = 51693554. Its totient is φ = 51693552.

The previous prime is 51693541. The next prime is 51693557. The reversal of 51693553 is 35539615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47169424 + 4524129 = 6868^2 + 2127^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51693553 is a prime.

It is not a weakly prime, because it can be changed into another prime (51693557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25846776 + 25846777.

It is an arithmetic number, because the mean of its divisors is an integer number (25846777).

Almost surely, 2^51693553 is an apocalyptic number.

It is an amenable number.

51693553 is a deficient number, since it is larger than the sum of its proper divisors (1).

51693553 is an equidigital number, since it uses as much as digits as its factorization.

51693553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60750, while the sum is 37.

The square root of 51693553 is about 7189.8228768169. The cubic root of 51693553 is about 372.5164546880.

The spelling of 51693553 in words is "fifty-one million, six hundred ninety-three thousand, five hundred fifty-three".