1376245561 has 2 divisors, whose sum is σ = 1376245562. Its totient is φ = 1376245560.

The previous prime is 1376245529. The next prime is 1376245571. The reversal of 1376245561 is 1655426731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1334513961 + 41731600 = 36531^2 + 6460^2 .

It is a cyclic number.

It is not a de Polignac number, because 1376245561 - 2⁵ = 1376245529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1376245501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688122780 + 688122781.

It is an arithmetic number, because the mean of its divisors is an integer number (688122781).

Almost surely, 2^1376245561 is an apocalyptic number.

It is an amenable number.

1376245561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1376245561 is an equidigital number, since it uses as much as digits as its factorization.

1376245561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 40.

The square root of 1376245561 is about 37097.7837747755. The cubic root of 1376245561 is about 1112.3257139928.

The spelling of 1376245561 in words is "one billion, three hundred seventy-six million, two hundred forty-five thousand, five hundred sixty-one".