6247642091 has 2 divisors, whose sum is σ = 6247642092. Its totient is φ = 6247642090.

The previous prime is 6247642087. The next prime is 6247642097. The reversal of 6247642091 is 1902467426.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6247642091 - 2² = 6247642087 is a prime.

It is not a weakly prime, because it can be changed into another prime (6247642097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3123821045 + 3123821046.

It is an arithmetic number, because the mean of its divisors is an integer number (3123821046).

Almost surely, 2^6247642091 is an apocalyptic number.

6247642091 is a deficient number, since it is larger than the sum of its proper divisors (1).

6247642091 is an equidigital number, since it uses as much as digits as its factorization.

6247642091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 6247642091 is about 79042.0273715193. The cubic root of 6247642091 is about 1841.7840772231.

The spelling of 6247642091 in words is "six billion, two hundred forty-seven million, six hundred forty-two thousand, ninety-one".