610646381 has 2 divisors, whose sum is σ = 610646382. Its totient is φ = 610646380.

The previous prime is 610646371. The next prime is 610646423. The reversal of 610646381 is 183646016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 337273225 + 273373156 = 18365^2 + 16534^2 .

It is a cyclic number.

It is not a de Polignac number, because 610646381 - 2⁶ = 610646317 is a prime.

It is a super-2 number, since 2×610646381² = 745778005256794322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (610646371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305323190 + 305323191.

It is an arithmetic number, because the mean of its divisors is an integer number (305323191).

Almost surely, 2^610646381 is an apocalyptic number.

It is an amenable number.

610646381 is a deficient number, since it is larger than the sum of its proper divisors (1).

610646381 is an equidigital number, since it uses as much as digits as its factorization.

610646381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 610646381 is about 24711.2602066345. The cubic root of 610646381 is about 848.3920609985.

The spelling of 610646381 in words is "six hundred ten million, six hundred forty-six thousand, three hundred eighty-one".