1392505661 has 2 divisors, whose sum is σ = 1392505662. Its totient is φ = 1392505660.

The previous prime is 1392505657. The next prime is 1392505663. The reversal of 1392505661 is 1665052931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1310874436 + 81631225 = 36206^2 + 9035^2 .

It is a cyclic number.

It is not a de Polignac number, because 1392505661 - 2² = 1392505657 is a prime.

Together with 1392505663, 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 (1392505663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696252830 + 696252831.

It is an arithmetic number, because the mean of its divisors is an integer number (696252831).

Almost surely, 2^1392505661 is an apocalyptic number.

It is an amenable number.

1392505661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1392505661 is an equidigital number, since it uses as much as digits as its factorization.

1392505661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 1392505661 is about 37316.2921657552. The cubic root of 1392505661 is about 1116.6892185936.

The spelling of 1392505661 in words is "one billion, three hundred ninety-two million, five hundred five thousand, six hundred sixty-one".