51977902 has 4 divisors (see below), whose sum is σ = 77966856. Its totient is φ = 25988950.

The previous prime is 51977897. The next prime is 51977903. The reversal of 51977902 is 20977915.

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

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51977903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12994474 + ... + 12994477.

It is an arithmetic number, because the mean of its divisors is an integer number (19491714).

Almost surely, 2^51977902 is an apocalyptic number.

51977902 is a deficient number, since it is larger than the sum of its proper divisors (25988954).

51977902 is a wasteful number, since it uses less digits than its factorization.

51977902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25988953.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 51977902 is about 7209.5701674927. The cubic root of 51977902 is about 373.1982357343.

The spelling of 51977902 in words is "fifty-one million, nine hundred seventy-seven thousand, nine hundred two".