428965991 has 2 divisors, whose sum is σ = 428965992. Its totient is φ = 428965990.

The previous prime is 428965951. The next prime is 428966011. The reversal of 428965991 is 199569824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428965991 - 2²⁶ = 361857127 is a prime.

It is a super-2 number, since 2×428965991² = 368023642869224162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428965921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214482995 + 214482996.

It is an arithmetic number, because the mean of its divisors is an integer number (214482996).

Almost surely, 2^428965991 is an apocalyptic number.

428965991 is a deficient number, since it is larger than the sum of its proper divisors (1).

428965991 is an equidigital number, since it uses as much as digits as its factorization.

428965991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 53.

The square root of 428965991 is about 20711.4941759401. The cubic root of 428965991 is about 754.1787429762.

The spelling of 428965991 in words is "four hundred twenty-eight million, nine hundred sixty-five thousand, nine hundred ninety-one".