51891554 has 16 divisors (see below), whose sum is σ = 91445760. Its totient is φ = 21772560.

The previous prime is 51891533. The next prime is 51891569. The reversal of 51891554 is 45519815.

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, 90434 + ... + 91005.

It is an arithmetic number, because the mean of its divisors is an integer number (5715360).

Almost surely, 2^51891554 is an apocalyptic number.

51891554 is a deficient number, since it is larger than the sum of its proper divisors (39554206).

51891554 is a wasteful number, since it uses less digits than its factorization.

51891554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181465.

The product of its digits is 36000, while the sum is 38.

The square root of 51891554 is about 7203.5792492344. The cubic root of 51891554 is about 372.9914633624.

The spelling of 51891554 in words is "fifty-one million, eight hundred ninety-one thousand, five hundred fifty-four".