291064399 has 2 divisors, whose sum is σ = 291064400. Its totient is φ = 291064398.

The previous prime is 291064351. The next prime is 291064409. The reversal of 291064399 is 993460192.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 291064399 - 2¹⁷ = 290933327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291064999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145532199 + 145532200.

It is an arithmetic number, because the mean of its divisors is an integer number (145532200).

Almost surely, 2^291064399 is an apocalyptic number.

291064399 is a deficient number, since it is larger than the sum of its proper divisors (1).

291064399 is an equidigital number, since it uses as much as digits as its factorization.

291064399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 291064399 is about 17060.6095729314. The cubic root of 291064399 is about 662.7194186702.

The spelling of 291064399 in words is "two hundred ninety-one million, sixty-four thousand, three hundred ninety-nine".