51697405 has 8 divisors (see below), whose sum is σ = 62119512. Its totient is φ = 41302848.

The previous prime is 51697381. The next prime is 51697409. The reversal of 51697405 is 50479615.

It can be written as a sum of positive squares in 4 ways, for example, as 116281 + 51581124 = 341^2 + 7182^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51697405 - 2¹³ = 51689213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51697409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2502 + ... + 10471.

It is an arithmetic number, because the mean of its divisors is an integer number (7764939).

Almost surely, 2^51697405 is an apocalyptic number.

It is an amenable number.

51697405 is a deficient number, since it is larger than the sum of its proper divisors (10422107).

51697405 is a wasteful number, since it uses less digits than its factorization.

51697405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13775.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 51697405 is about 7190.0907504704. The cubic root of 51697405 is about 372.5257072780.

The spelling of 51697405 in words is "fifty-one million, six hundred ninety-seven thousand, four hundred five".