1379123261 has 2 divisors, whose sum is σ = 1379123262. Its totient is φ = 1379123260.

The previous prime is 1379123231. The next prime is 1379123323. The reversal of 1379123261 is 1623219731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1372332025 + 6791236 = 37045^2 + 2606^2 .

It is a cyclic number.

It is not a de Polignac number, because 1379123261 - 2¹⁰ = 1379122237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1379123201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689561630 + 689561631.

It is an arithmetic number, because the mean of its divisors is an integer number (689561631).

Almost surely, 2^1379123261 is an apocalyptic number.

It is an amenable number.

1379123261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1379123261 is an equidigital number, since it uses as much as digits as its factorization.

1379123261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 1379123261 is about 37136.5488568876. The cubic root of 1379123261 is about 1113.1004573365.

The spelling of 1379123261 in words is "one billion, three hundred seventy-nine million, one hundred twenty-three thousand, two hundred sixty-one".