51891897 has 16 divisors (see below), whose sum is σ = 70398720. Its totient is φ = 33995472.

The previous prime is 51891883. The next prime is 51891899. The reversal of 51891897 is 79819815.

It is not a de Polignac number, because 51891897 - 2¹⁶ = 51826361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51891899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44038 + ... + 45200.

It is an arithmetic number, because the mean of its divisors is an integer number (4399920).

Almost surely, 2^51891897 is an apocalyptic number.

It is an amenable number.

51891897 is a deficient number, since it is larger than the sum of its proper divisors (18506823).

51891897 is a wasteful number, since it uses less digits than its factorization.

51891897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412.

The product of its digits is 181440, while the sum is 48.

The square root of 51891897 is about 7203.6030568043. The cubic root of 51891897 is about 372.9922851775.

The spelling of 51891897 in words is "fifty-one million, eight hundred ninety-one thousand, eight hundred ninety-seven".