1377921959 has 2 divisors, whose sum is σ = 1377921960. Its totient is φ = 1377921958.

The previous prime is 1377921947. The next prime is 1377921977. The reversal of 1377921959 is 9591297731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1377921959 - 2⁸ = 1377921703 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1377921959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1377921929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688960979 + 688960980.

It is an arithmetic number, because the mean of its divisors is an integer number (688960980).

Almost surely, 2^1377921959 is an apocalyptic number.

1377921959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377921959 is an equidigital number, since it uses as much as digits as its factorization.

1377921959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1071630, while the sum is 53.

The square root of 1377921959 is about 37120.3712131223. The cubic root of 1377921959 is about 1112.7771702444. Note that the first 3 decimals are identical.

The spelling of 1377921959 in words is "one billion, three hundred seventy-seven million, nine hundred twenty-one thousand, nine hundred fifty-nine".