651831961 has 15 divisors (see below), whose sum is σ = 720424965. Its totient is φ = 589766100.

The previous prime is 651831959. The next prime is 651831967. The reversal of 651831961 is 169138156.

The square root of 651831961 is 25531.

It is a perfect power (a square), and thus also a powerful number.

651831961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 651831961 - 2¹ = 651831959 is a prime.

It is a super-2 number, since 2×651831961² = 849769810762211042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651831967) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3089146 + ... + 3089356.

It is an arithmetic number, because the mean of its divisors is an integer number (48028331).

Almost surely, 2^651831961 is an apocalyptic number.

651831961 is the 25531-st square number.

651831961 is the 12766-th centered octagonal number.

It is an amenable number.

651831961 is a deficient number, since it is larger than the sum of its proper divisors (68593004).

651831961 is an frugal number, since it uses more digits than its factorization.

651831961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 222 counting only the distinct ones).

The product of its digits is 38880, while the sum is 40.

The cubic root of 651831961 is about 867.0521452034.

The spelling of 651831961 in words is "six hundred fifty-one million, eight hundred thirty-one thousand, nine hundred sixty-one".