291438107971 has 2 divisors, whose sum is σ = 291438107972. Its totient is φ = 291438107970.

The previous prime is 291438107927. The next prime is 291438107981. The reversal of 291438107971 is 179701834192.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 291438107971 - 2²¹ = 291436010819 is a prime.

It is not a weakly prime, because it can be changed into another prime (291438107981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145719053985 + 145719053986.

It is an arithmetic number, because the mean of its divisors is an integer number (145719053986).

Almost surely, 2^291438107971 is an apocalyptic number.

291438107971 is a deficient number, since it is larger than the sum of its proper divisors (1).

291438107971 is an equidigital number, since it uses as much as digits as its factorization.

291438107971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 52.

The spelling of 291438107971 in words is "two hundred ninety-one billion, four hundred thirty-eight million, one hundred seven thousand, nine hundred seventy-one".