651016381 has 2 divisors, whose sum is σ = 651016382. Its totient is φ = 651016380.

The previous prime is 651016349. The next prime is 651016397. The reversal of 651016381 is 183610156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 651015225 + 1156 = 25515^2 + 34^2 .

It is a cyclic number.

It is not a de Polignac number, because 651016381 - 2⁵ = 651016349 is a prime.

It is a super-2 number, since 2×651016381² = 847644656660674322, 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 (651016181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325508190 + 325508191.

It is an arithmetic number, because the mean of its divisors is an integer number (325508191).

Almost surely, 2^651016381 is an apocalyptic number.

It is an amenable number.

651016381 is a deficient number, since it is larger than the sum of its proper divisors (1).

651016381 is an equidigital number, since it uses as much as digits as its factorization.

651016381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 651016381 is about 25515.0226533311. The cubic root of 651016381 is about 866.6903722477.

The spelling of 651016381 in words is "six hundred fifty-one million, sixteen thousand, three hundred eighty-one".