51431642 has 4 divisors (see below), whose sum is σ = 77147466. Its totient is φ = 25715820.

The previous prime is 51431629. The next prime is 51431663. The reversal of 51431642 is 24613415.

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., 34939921 + 16491721 = 5911^2 + 4061^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12857909 + ... + 12857912.

Almost surely, 2^51431642 is an apocalyptic number.

51431642 is a deficient number, since it is larger than the sum of its proper divisors (25715824).

51431642 is a wasteful number, since it uses less digits than its factorization.

51431642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25715823.

The product of its digits is 2880, while the sum is 26.

The square root of 51431642 is about 7171.5857381753. The cubic root of 51431642 is about 371.8862574753.

The spelling of 51431642 in words is "fifty-one million, four hundred thirty-one thousand, six hundred forty-two".