51402413 has 4 divisors (see below), whose sum is σ = 53174940. Its totient is φ = 49629888.

The previous prime is 51402409. The next prime is 51402437. The reversal of 51402413 is 31420415.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18992164 + 32410249 = 4358^2 + 5693^2 .

It is a cyclic number.

It is not a de Polignac number, because 51402413 - 2² = 51402409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51402473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 886220 + ... + 886277.

It is an arithmetic number, because the mean of its divisors is an integer number (13293735).

Almost surely, 2^51402413 is an apocalyptic number.

It is an amenable number.

51402413 is a deficient number, since it is larger than the sum of its proper divisors (1772527).

51402413 is a wasteful number, since it uses less digits than its factorization.

51402413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772526.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 51402413 is about 7169.5476147383. The cubic root of 51402413 is about 371.8157955133.

Adding to 51402413 its reverse (31420415), we get a palindrome (82822828).

It can be divided in two parts, 51402 and 413, that added together give a palindrome (51815).

The spelling of 51402413 in words is "fifty-one million, four hundred two thousand, four hundred thirteen".