1954913993 has 2 divisors, whose sum is σ = 1954913994. Its totient is φ = 1954913992.

The previous prime is 1954913977. The next prime is 1954913999. The reversal of 1954913993 is 3993194591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1499006089 + 455907904 = 38717^2 + 21352^2 .

It is a cyclic number.

It is not a de Polignac number, because 1954913993 - 2⁴ = 1954913977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1954913999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977456996 + 977456997.

It is an arithmetic number, because the mean of its divisors is an integer number (977456997).

Almost surely, 2^1954913993 is an apocalyptic number.

It is an amenable number.

1954913993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1954913993 is an equidigital number, since it uses as much as digits as its factorization.

1954913993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1180980, while the sum is 53.

The square root of 1954913993 is about 44214.4093367762. The cubic root of 1954913993 is about 1250.3815353728.

The spelling of 1954913993 in words is "one billion, nine hundred fifty-four million, nine hundred thirteen thousand, nine hundred ninety-three".