651457381 has 2 divisors, whose sum is σ = 651457382. Its totient is φ = 651457380.

The previous prime is 651457333. The next prime is 651457501. The reversal of 651457381 is 183754156.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 483340225 + 168117156 = 21985^2 + 12966^2 .

It is a cyclic number.

It is not a de Polignac number, because 651457381 - 2⁷ = 651457253 is a prime.

It is a super-2 number, since 2×651457381² = 848793438518758322, 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 (651257381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325728690 + 325728691.

It is an arithmetic number, because the mean of its divisors is an integer number (325728691).

Almost surely, 2^651457381 is an apocalyptic number.

It is an amenable number.

651457381 is a deficient number, since it is larger than the sum of its proper divisors (1).

651457381 is an equidigital number, since it uses as much as digits as its factorization.

651457381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 40.

The square root of 651457381 is about 25523.6631579403. The cubic root of 651457381 is about 866.8860274285.

The spelling of 651457381 in words is "six hundred fifty-one million, four hundred fifty-seven thousand, three hundred eighty-one".