51881458 has 4 divisors (see below), whose sum is σ = 77822190. Its totient is φ = 25940728.

The previous prime is 51881443. The next prime is 51881471. The reversal of 51881458 is 85418815.

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

It can be written as a sum of positive squares in only one way, i.e., 36881329 + 15000129 = 6073^2 + 3873^2 .

It is a super-3 number, since 3×51881458³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 51881458.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12970363 + ... + 12970366.

Almost surely, 2^51881458 is an apocalyptic number.

51881458 is a deficient number, since it is larger than the sum of its proper divisors (25940732).

51881458 is a wasteful number, since it uses less digits than its factorization.

51881458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25940731.

The product of its digits is 51200, while the sum is 40.

The square root of 51881458 is about 7202.8784523967. The cubic root of 51881458 is about 372.9672721035.

The spelling of 51881458 in words is "fifty-one million, eight hundred eighty-one thousand, four hundred fifty-eight".