1391961653 has 2 divisors, whose sum is σ = 1391961654. Its totient is φ = 1391961652.

The previous prime is 1391961647. The next prime is 1391961661. The reversal of 1391961653 is 3561691931.

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., 1326562084 + 65399569 = 36422^2 + 8087^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391961653 - 2⁶ = 1391961589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391969653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695980826 + 695980827.

It is an arithmetic number, because the mean of its divisors is an integer number (695980827).

Almost surely, 2^1391961653 is an apocalyptic number.

It is an amenable number.

1391961653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391961653 is an equidigital number, since it uses as much as digits as its factorization.

1391961653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 44.

The square root of 1391961653 is about 37309.0023050738. The cubic root of 1391961653 is about 1116.5437812448.

The spelling of 1391961653 in words is "one billion, three hundred ninety-one million, nine hundred sixty-one thousand, six hundred fifty-three".