51691546 has 4 divisors (see below), whose sum is σ = 77537322. Its totient is φ = 25845772.

The previous prime is 51691537. The next prime is 51691559. The reversal of 51691546 is 64519615.

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., 36784225 + 14907321 = 6065^2 + 3861^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12922885 + ... + 12922888.

Almost surely, 2^51691546 is an apocalyptic number.

51691546 is a deficient number, since it is larger than the sum of its proper divisors (25845776).

51691546 is a wasteful number, since it uses less digits than its factorization.

51691546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25845775.

The product of its digits is 32400, while the sum is 37.

The square root of 51691546 is about 7189.6833031782. The cubic root of 51691546 is about 372.5116336471.

It can be divided in two parts, 516915 and 46, that added together give a square (516961 = 719²).

The spelling of 51691546 in words is "fifty-one million, six hundred ninety-one thousand, five hundred forty-six".