651993881 has 16 divisors (see below), whose sum is σ = 816386688. Its totient is φ = 505852800.

The previous prime is 651993869. The next prime is 651993887. The reversal of 651993881 is 188399156.

It is a happy number.

651993881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 651993881 - 2¹⁴ = 651977497 is a prime.

It is a super-2 number, since 2×651993881² = 850192041722884322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651993887) 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, 230 + ... + 36111.

It is an arithmetic number, because the mean of its divisors is an integer number (51024168).

Almost surely, 2^651993881 is an apocalyptic number.

It is an amenable number.

651993881 is a deficient number, since it is larger than the sum of its proper divisors (164392807).

651993881 is a wasteful number, since it uses less digits than its factorization.

651993881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36592.

The product of its digits is 466560, while the sum is 50.

The square root of 651993881 is about 25534.1708500589. The cubic root of 651993881 is about 867.1239333679.

The spelling of 651993881 in words is "six hundred fifty-one million, nine hundred ninety-three thousand, eight hundred eighty-one".