402912661 has 2 divisors, whose sum is σ = 402912662. Its totient is φ = 402912660.

The previous prime is 402912659. The next prime is 402912677. The reversal of 402912661 is 166219204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392634225 + 10278436 = 19815^2 + 3206^2 .

It is a cyclic number.

It is not a de Polignac number, because 402912661 - 2¹ = 402912659 is a prime.

It is a super-2 number, since 2×402912661² = 324677224788201842, which contains 22 as substring.

Together with 402912659, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402912361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201456330 + 201456331.

It is an arithmetic number, because the mean of its divisors is an integer number (201456331).

Almost surely, 2^402912661 is an apocalyptic number.

It is an amenable number.

402912661 is a deficient number, since it is larger than the sum of its proper divisors (1).

402912661 is an equidigital number, since it uses as much as digits as its factorization.

402912661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 402912661 is about 20072.6844492709. The cubic root of 402912661 is about 738.5903655388.

The spelling of 402912661 in words is "four hundred two million, nine hundred twelve thousand, six hundred sixty-one".