2497181971 has 2 divisors, whose sum is σ = 2497181972. Its totient is φ = 2497181970.

The previous prime is 2497181959. The next prime is 2497181977. The reversal of 2497181971 is 1791817942.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2497181971 is a prime.

It is not a weakly prime, because it can be changed into another prime (2497181977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1248590985 + 1248590986.

It is an arithmetic number, because the mean of its divisors is an integer number (1248590986).

Almost surely, 2^2497181971 is an apocalyptic number.

2497181971 is a deficient number, since it is larger than the sum of its proper divisors (1).

2497181971 is an equidigital number, since it uses as much as digits as its factorization.

2497181971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 49.

The square root of 2497181971 is about 49971.8117642336. The cubic root of 2497181971 is about 1356.6986627313.

The spelling of 2497181971 in words is "two billion, four hundred ninety-seven million, one hundred eighty-one thousand, nine hundred seventy-one".