651974381 has 2 divisors, whose sum is σ = 651974382. Its totient is φ = 651974380.

The previous prime is 651974339. The next prime is 651974413. The reversal of 651974381 is 183479156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622053481 + 29920900 = 24941^2 + 5470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651974381 is a prime.

It is a super-2 number, since 2×651974381² = 850141186960666322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651974581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325987190 + 325987191.

It is an arithmetic number, because the mean of its divisors is an integer number (325987191).

Almost surely, 2^651974381 is an apocalyptic number.

It is an amenable number.

651974381 is a deficient number, since it is larger than the sum of its proper divisors (1).

651974381 is an equidigital number, since it uses as much as digits as its factorization.

651974381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 651974381 is about 25533.7890059427. The cubic root of 651974381 is about 867.1152885601.

The spelling of 651974381 in words is "six hundred fifty-one million, nine hundred seventy-four thousand, three hundred eighty-one".