1955113681 has 2 divisors, whose sum is σ = 1955113682. Its totient is φ = 1955113680.

The previous prime is 1955113669. The next prime is 1955113687. The reversal of 1955113681 is 1863115591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1954966225 + 147456 = 44215^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 1955113681 - 2⁵ = 1955113649 is a prime.

It is a super-2 number, since 2×1955113681² = 7644939011266739522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1955113687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977556840 + 977556841.

It is an arithmetic number, because the mean of its divisors is an integer number (977556841).

Almost surely, 2^1955113681 is an apocalyptic number.

It is an amenable number.

1955113681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955113681 is an equidigital number, since it uses as much as digits as its factorization.

1955113681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 40.

The square root of 1955113681 is about 44216.6674569669. The cubic root of 1955113681 is about 1250.4241080363.

The spelling of 1955113681 in words is "one billion, nine hundred fifty-five million, one hundred thirteen thousand, six hundred eighty-one".