51252002213 has 4 divisors (see below), whose sum is σ = 52637191500. Its totient is φ = 49866812928.

The previous prime is 51252002171. The next prime is 51252002261. The reversal of 51252002213 is 31220025215.

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 48637009444 + 2614992769 = 220538^2 + 51137^2 .

It is a cyclic number.

It is not a de Polignac number, because 51252002213 - 2⁶ = 51252002149 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 (51252005213) 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, 692594588 + ... + 692594661.

It is an arithmetic number, because the mean of its divisors is an integer number (13159297875).

Almost surely, 2^51252002213 is an apocalyptic number.

It is an amenable number.

51252002213 is a deficient number, since it is larger than the sum of its proper divisors (1385189287).

51252002213 is a wasteful number, since it uses less digits than its factorization.

51252002213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385189286.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 51252002213 its reverse (31220025215), we get a palindrome (82472027428).

The spelling of 51252002213 in words is "fifty-one billion, two hundred fifty-two million, two thousand, two hundred thirteen".