651874891 has 2 divisors, whose sum is σ = 651874892. Its totient is φ = 651874890.

The previous prime is 651874859. The next prime is 651874921. The reversal of 651874891 is 198478156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 651874891 - 2⁵ = 651874859 is a prime.

It is not a weakly prime, because it can be changed into another prime (651874801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325937445 + 325937446.

It is an arithmetic number, because the mean of its divisors is an integer number (325937446).

Almost surely, 2^651874891 is an apocalyptic number.

651874891 is a deficient number, since it is larger than the sum of its proper divisors (1).

651874891 is an equidigital number, since it uses as much as digits as its factorization.

651874891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 49.

The square root of 651874891 is about 25531.8407287841. The cubic root of 651874891 is about 867.0711796242.

The spelling of 651874891 in words is "six hundred fifty-one million, eight hundred seventy-four thousand, eight hundred ninety-one".