51076381 has 4 divisors (see below), whose sum is σ = 54080892. Its totient is φ = 48071872.

The previous prime is 51076379. The next prime is 51076433. The reversal of 51076381 is 18367015.

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 19660356 + 31416025 = 4434^2 + 5605^2 .

It is a cyclic number.

It is not a de Polignac number, because 51076381 - 2¹ = 51076379 is a prime.

It is a super-2 number, since 2×51076381² = 5217593392114322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51076301) 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, 1502230 + ... + 1502263.

It is an arithmetic number, because the mean of its divisors is an integer number (13520223).

Almost surely, 2^51076381 is an apocalyptic number.

It is an amenable number.

51076381 is a deficient number, since it is larger than the sum of its proper divisors (3004511).

51076381 is a wasteful number, since it uses less digits than its factorization.

51076381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004510.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 51076381 is about 7146.7741674129. The cubic root of 51076381 is about 371.0280176359.

The spelling of 51076381 in words is "fifty-one million, seventy-six thousand, three hundred eighty-one".