2918391961 has 6 divisors (see below), whose sum is σ = 3050795930. Its totient is φ = 2791504848.

The previous prime is 2918391953. The next prime is 2918391991. The reversal of 2918391961 is 1691938192.

2918391961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2896592400 + 21799561 = 53820^2 + 4669^2 .

It is not a de Polignac number, because 2918391961 - 2³ = 2918391953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2918391991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2757876 + ... + 2758933.

Almost surely, 2^2918391961 is an apocalyptic number.

It is an amenable number.

2918391961 is a deficient number, since it is larger than the sum of its proper divisors (132403969).

2918391961 is an equidigital number, since it uses as much as digits as its factorization.

2918391961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5516855 (or 5516832 counting only the distinct ones).

The product of its digits is 209952, while the sum is 49.

The square root of 2918391961 is about 54022.1432470057. The cubic root of 2918391961 is about 1429.0514780130.

The spelling of 2918391961 in words is "two billion, nine hundred eighteen million, three hundred ninety-one thousand, nine hundred sixty-one".