271791991 has 2 divisors, whose sum is σ = 271791992. Its totient is φ = 271791990.

The previous prime is 271791983. The next prime is 271792009. The reversal of 271791991 is 199197172.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 271791991 - 2³ = 271791983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (271791901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135895995 + 135895996.

It is an arithmetic number, because the mean of its divisors is an integer number (135895996).

Almost surely, 2^271791991 is an apocalyptic number.

271791991 is a deficient number, since it is larger than the sum of its proper divisors (1).

271791991 is an equidigital number, since it uses as much as digits as its factorization.

271791991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 46.

The square root of 271791991 is about 16486.1150972568. The cubic root of 271791991 is about 647.7571543089.

The spelling of 271791991 in words is "two hundred seventy-one million, seven hundred ninety-one thousand, nine hundred ninety-one".