3905497991 has 2 divisors, whose sum is σ = 3905497992. Its totient is φ = 3905497990.

The previous prime is 3905497951. The next prime is 3905498027. The reversal of 3905497991 is 1997945093.

3905497991 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3905497991 - 2¹⁰ = 3905496967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3905497901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1952748995 + 1952748996.

It is an arithmetic number, because the mean of its divisors is an integer number (1952748996).

Almost surely, 2^3905497991 is an apocalyptic number.

3905497991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3905497991 is an equidigital number, since it uses as much as digits as its factorization.

3905497991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2755620, while the sum is 56.

The square root of 3905497991 is about 62493.9836384271. The cubic root of 3905497991 is about 1574.8002422058.

The spelling of 3905497991 in words is "three billion, nine hundred five million, four hundred ninety-seven thousand, nine hundred ninety-one".