51401813 has 8 divisors (see below), whose sum is σ = 54295296. Its totient is φ = 48585600.

The previous prime is 51401807. The next prime is 51401839. The reversal of 51401813 is 31810415.

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 51401813 - 2²² = 47207509 is a prime.

It is a super-3 number, since 3×51401813³ (a number of 24 digits) contains 333 as substring.

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 (51401873) 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, 17948 + ... + 20613.

It is an arithmetic number, because the mean of its divisors is an integer number (6786912).

Almost surely, 2^51401813 is an apocalyptic number.

It is an amenable number.

51401813 is a deficient number, since it is larger than the sum of its proper divisors (2893483).

51401813 is a wasteful number, since it uses less digits than its factorization.

51401813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38635.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 51401813 is about 7169.5057709719. The cubic root of 51401813 is about 371.8143488215.

The spelling of 51401813 in words is "fifty-one million, four hundred one thousand, eight hundred thirteen".