51771842 has 4 divisors (see below), whose sum is σ = 77657766. Its totient is φ = 25885920.

The previous prime is 51771821. The next prime is 51771877. The reversal of 51771842 is 24817715.

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., 43309561 + 8462281 = 6581^2 + 2909^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12942959 + ... + 12942962.

Almost surely, 2^51771842 is an apocalyptic number.

51771842 is a deficient number, since it is larger than the sum of its proper divisors (25885924).

51771842 is a wasteful number, since it uses less digits than its factorization.

51771842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25885923.

The product of its digits is 15680, while the sum is 35.

The square root of 51771842 is about 7195.2652487591. The cubic root of 51771842 is about 372.7044164269.

The spelling of 51771842 in words is "fifty-one million, seven hundred seventy-one thousand, eight hundred forty-two".