51131798 has 4 divisors (see below), whose sum is σ = 76697700. Its totient is φ = 25565898.

The previous prime is 51131777. The next prime is 51131837. The reversal of 51131798 is 89713115.

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

It is a super-2 number, since 2×51131798² = 5228921533425608, which contains 22 as substring.

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, 12782948 + ... + 12782951.

It is an arithmetic number, because the mean of its divisors is an integer number (19174425).

Almost surely, 2^51131798 is an apocalyptic number.

51131798 is a deficient number, since it is larger than the sum of its proper divisors (25565902).

51131798 is a wasteful number, since it uses less digits than its factorization.

51131798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25565901.

The product of its digits is 7560, while the sum is 35.

The square root of 51131798 is about 7150.6501802284. The cubic root of 51131798 is about 371.1621554868.

The spelling of 51131798 in words is "fifty-one million, one hundred thirty-one thousand, seven hundred ninety-eight".