391041899 has 2 divisors, whose sum is σ = 391041900. Its totient is φ = 391041898.

The previous prime is 391041877. The next prime is 391041901. The reversal of 391041899 is 998140193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 391041899 - 2¹⁶ = 390976363 is a prime.

Together with 391041901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (391041809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195520949 + 195520950.

It is an arithmetic number, because the mean of its divisors is an integer number (195520950).

Almost surely, 2^391041899 is an apocalyptic number.

391041899 is a deficient number, since it is larger than the sum of its proper divisors (1).

391041899 is an equidigital number, since it uses as much as digits as its factorization.

391041899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 391041899 is about 19774.7793666579. The cubic root of 391041899 is about 731.2643997067.

The spelling of 391041899 in words is "three hundred ninety-one million, forty-one thousand, eight hundred ninety-nine".