51629813 has 4 divisors (see below), whose sum is σ = 52086828. Its totient is φ = 51172800.

The previous prime is 51629807. The next prime is 51629819. The reversal of 51629813 is 31892615.

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

It is an interprime number because it is at equal distance from previous prime (51629807) and next prime (51629819).

It can be written as a sum of positive squares in 2 ways, for example, as 10387729 + 41242084 = 3223^2 + 6422^2 .

It is a cyclic number.

It is not a de Polignac number, because 51629813 - 2⁴ = 51629797 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 (51629819) 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, 228338 + ... + 228563.

It is an arithmetic number, because the mean of its divisors is an integer number (13021707).

Almost surely, 2^51629813 is an apocalyptic number.

It is an amenable number.

51629813 is a deficient number, since it is larger than the sum of its proper divisors (457015).

51629813 is a wasteful number, since it uses less digits than its factorization.

51629813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457014.

The product of its digits is 12960, while the sum is 35.

The square root of 51629813 is about 7185.3888551699. The cubic root of 51629813 is about 372.3632830107.

The spelling of 51629813 in words is "fifty-one million, six hundred twenty-nine thousand, eight hundred thirteen".