1958379881 has 2 divisors, whose sum is σ = 1958379882. Its totient is φ = 1958379880.

The previous prime is 1958379817. The next prime is 1958379893. The reversal of 1958379881 is 1889738591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1936440025 + 21939856 = 44005^2 + 4684^2 .

It is a cyclic number.

It is not a de Polignac number, because 1958379881 - 2⁶ = 1958379817 is a prime.

It is a super-2 number, since 2×1958379881² = 7670503516611148322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1958379881.

It is not a weakly prime, because it can be changed into another prime (1958370881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 979189940 + 979189941.

It is an arithmetic number, because the mean of its divisors is an integer number (979189941).

Almost surely, 2^1958379881 is an apocalyptic number.

It is an amenable number.

1958379881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1958379881 is an equidigital number, since it uses as much as digits as its factorization.

1958379881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 59.

The square root of 1958379881 is about 44253.5860806783. The cubic root of 1958379881 is about 1251.1200373932.

The spelling of 1958379881 in words is "one billion, nine hundred fifty-eight million, three hundred seventy-nine thousand, eight hundred eighty-one".