651980731 has 2 divisors, whose sum is σ = 651980732. Its totient is φ = 651980730.

The previous prime is 651980723. The next prime is 651980773. The reversal of 651980731 is 137089156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 651980731 - 2³ = 651980723 is a prime.

It is a super-2 number, since 2×651980731² = 850157747190588722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (651980431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325990365 + 325990366.

It is an arithmetic number, because the mean of its divisors is an integer number (325990366).

Almost surely, 2^651980731 is an apocalyptic number.

651980731 is a deficient number, since it is larger than the sum of its proper divisors (1).

651980731 is an equidigital number, since it uses as much as digits as its factorization.

651980731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 651980731 is about 25533.9133506793. The cubic root of 651980731 is about 867.1181036831.

The spelling of 651980731 in words is "six hundred fifty-one million, nine hundred eighty thousand, seven hundred thirty-one".