2891517971 has 2 divisors, whose sum is σ = 2891517972. Its totient is φ = 2891517970.

The previous prime is 2891517943. The next prime is 2891517977. The reversal of 2891517971 is 1797151982.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2891517971 is a prime.

It is a super-3 number, since 3×2891517971³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2891517977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1445758985 + 1445758986.

It is an arithmetic number, because the mean of its divisors is an integer number (1445758986).

Almost surely, 2^2891517971 is an apocalyptic number.

2891517971 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891517971 is an equidigital number, since it uses as much as digits as its factorization.

2891517971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 50.

The square root of 2891517971 is about 53772.8367393799. The cubic root of 2891517971 is about 1424.6514745884.

The spelling of 2891517971 in words is "two billion, eight hundred ninety-one million, five hundred seventeen thousand, nine hundred seventy-one".