51642697 has 2 divisors, whose sum is σ = 51642698. Its totient is φ = 51642696.

The previous prime is 51642691. The next prime is 51642761. The reversal of 51642697 is 79624615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33825856 + 17816841 = 5816^2 + 4221^2 .

It is a cyclic number.

It is not a de Polignac number, because 51642697 - 2¹¹ = 51640649 is a prime.

It is not a weakly prime, because it can be changed into another prime (51642691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25821348 + 25821349.

It is an arithmetic number, because the mean of its divisors is an integer number (25821349).

Almost surely, 2^51642697 is an apocalyptic number.

It is an amenable number.

51642697 is a deficient number, since it is larger than the sum of its proper divisors (1).

51642697 is an equidigital number, since it uses as much as digits as its factorization.

51642697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 51642697 is about 7186.2853408420. The cubic root of 51642697 is about 372.3942543252.

The spelling of 51642697 in words is "fifty-one million, six hundred forty-two thousand, six hundred ninety-seven".