51891556 has 24 divisors (see below), whose sum is σ = 94248000. Its totient is φ = 24969504.

The previous prime is 51891533. The next prime is 51891569. The reversal of 51891556 is 65519815.

It is a super-2 number, since 2×51891556² = 5385467168202272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50415 + ... + 51433.

It is an arithmetic number, because the mean of its divisors is an integer number (3927000).

Almost surely, 2^51891556 is an apocalyptic number.

It is an amenable number.

51891556 is a deficient number, since it is larger than the sum of its proper divisors (42356444).

51891556 is a wasteful number, since it uses less digits than its factorization.

51891556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491 (or 1489 counting only the distinct ones).

The product of its digits is 54000, while the sum is 40.

The square root of 51891556 is about 7203.5793880542. The cubic root of 51891556 is about 372.9914681544.

The spelling of 51891556 in words is "fifty-one million, eight hundred ninety-one thousand, five hundred fifty-six".