425190991 has 2 divisors, whose sum is σ = 425190992. Its totient is φ = 425190990.

The previous prime is 425190979. The next prime is 425191001. The reversal of 425190991 is 199091524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 425190991 - 2⁵ = 425190959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425190391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212595495 + 212595496.

It is an arithmetic number, because the mean of its divisors is an integer number (212595496).

Almost surely, 2^425190991 is an apocalyptic number.

425190991 is a deficient number, since it is larger than the sum of its proper divisors (1).

425190991 is an equidigital number, since it uses as much as digits as its factorization.

425190991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 425190991 is about 20620.1598199432. The cubic root of 425190991 is about 751.9599056024.

The spelling of 425190991 in words is "four hundred twenty-five million, one hundred ninety thousand, nine hundred ninety-one".