51070813 has 8 divisors (see below), whose sum is σ = 52567200. Its totient is φ = 49595568.

The previous prime is 51070807. The next prime is 51070837. The reversal of 51070813 is 31807015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51070813 - 2⁹ = 51070301 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 (51070883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318 + ... + 10111.

It is an arithmetic number, because the mean of its divisors is an integer number (6570900).

Almost surely, 2^51070813 is an apocalyptic number.

It is an amenable number.

51070813 is a deficient number, since it is larger than the sum of its proper divisors (1496387).

51070813 is a wasteful number, since it uses less digits than its factorization.

51070813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10571.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 51070813 is about 7146.3846104167. The cubic root of 51070813 is about 371.0145348282.

Adding to 51070813 its reverse (31807015), we get a palindrome (82877828).

The spelling of 51070813 in words is "fifty-one million, seventy thousand, eight hundred thirteen".