2591771947 has 2 divisors, whose sum is σ = 2591771948. Its totient is φ = 2591771946.

The previous prime is 2591771939. The next prime is 2591771999. The reversal of 2591771947 is 7491771952.

It is a happy number.

It is an a-pointer prime, because the next prime (2591771999) can be obtained adding 2591771947 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2591771947 - 2³ = 2591771939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2591771894 and 2591771903.

It is not a weakly prime, because it can be changed into another prime (2591771927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1295885973 + 1295885974.

It is an arithmetic number, because the mean of its divisors is an integer number (1295885974).

Almost surely, 2^2591771947 is an apocalyptic number.

2591771947 is a deficient number, since it is larger than the sum of its proper divisors (1).

2591771947 is an equidigital number, since it uses as much as digits as its factorization.

2591771947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 52.

The square root of 2591771947 is about 50909.4485041824. The cubic root of 2591771947 is about 1373.6168035372.

The spelling of 2591771947 in words is "two billion, five hundred ninety-one million, seven hundred seventy-one thousand, nine hundred forty-seven".