51881451 has 8 divisors (see below), whose sum is σ = 69287424. Its totient is φ = 34531560.

The previous prime is 51881443. The next prime is 51881471. The reversal of 51881451 is 15418815.

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

It is not a de Polignac number, because 51881451 - 2³ = 51881443 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51881471) 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, 11811 + ... + 15596.

It is an arithmetic number, because the mean of its divisors is an integer number (8660928).

Almost surely, 2^51881451 is an apocalyptic number.

51881451 is the 4556-th centered pentagonal number.

51881451 is a deficient number, since it is larger than the sum of its proper divisors (17405973).

51881451 is a wasteful number, since it uses less digits than its factorization.

51881451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28041.

The product of its digits is 6400, while the sum is 33.

The square root of 51881451 is about 7202.8779664798. The cubic root of 51881451 is about 372.9672553295.

The spelling of 51881451 in words is "fifty-one million, eight hundred eighty-one thousand, four hundred fifty-one".