51881902 has 4 divisors (see below), whose sum is σ = 77822856. Its totient is φ = 25940950.

The previous prime is 51881867. The next prime is 51881911. The reversal of 51881902 is 20918815.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12970474 + ... + 12970477.

It is an arithmetic number, because the mean of its divisors is an integer number (19455714).

Almost surely, 2^51881902 is an apocalyptic number.

51881902 is a deficient number, since it is larger than the sum of its proper divisors (25940954).

51881902 is a wasteful number, since it uses less digits than its factorization.

51881902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25940953.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 51881902 is about 7202.9092733423. The cubic root of 51881902 is about 372.9683360481.

The spelling of 51881902 in words is "fifty-one million, eight hundred eighty-one thousand, nine hundred two".