51415402 has 4 divisors (see below), whose sum is σ = 77123106. Its totient is φ = 25707700.

The previous prime is 51415379. The next prime is 51415447. The reversal of 51415402 is 20451415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34939921 + 16475481 = 5911^2 + 4059^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12853849 + ... + 12853852.

Almost surely, 2^51415402 is an apocalyptic number.

51415402 is a deficient number, since it is larger than the sum of its proper divisors (25707704).

51415402 is a wasteful number, since it uses less digits than its factorization.

51415402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25707703.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 51415402 is about 7170.4534026796. The cubic root of 51415402 is about 371.8471112197.

Adding to 51415402 its reverse (20451415), we get a palindrome (71866817).

The spelling of 51415402 in words is "fifty-one million, four hundred fifteen thousand, four hundred two".