51364402 has 4 divisors (see below), whose sum is σ = 77046606. Its totient is φ = 25682200.

The previous prime is 51364393. The next prime is 51364409. The reversal of 51364402 is 20446315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20446315 = 5 ⋅4089263.

It can be written as a sum of positive squares in only one way, i.e., 50112241 + 1252161 = 7079^2 + 1119^2 .

It is not an unprimeable number, because it can be changed into a prime (51364409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12841099 + ... + 12841102.

Almost surely, 2^51364402 is an apocalyptic number.

51364402 is a deficient number, since it is larger than the sum of its proper divisors (25682204).

51364402 is a wasteful number, since it uses less digits than its factorization.

51364402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25682203.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 51364402 is about 7166.8962598882. The cubic root of 51364402 is about 371.7241229340.

The spelling of 51364402 in words is "fifty-one million, three hundred sixty-four thousand, four hundred two".