422587991 has 4 divisors (see below), whose sum is σ = 482957712. Its totient is φ = 362218272.

The previous prime is 422587933. The next prime is 422587999. The reversal of 422587991 is 199785224.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 422587991 - 2¹⁴ = 422571607 is a prime.

It is a super-2 number, since 2×422587991² = 357161220274832162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422587999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30184850 + ... + 30184863.

It is an arithmetic number, because the mean of its divisors is an integer number (120739428).

Almost surely, 2^422587991 is an apocalyptic number.

422587991 is a deficient number, since it is larger than the sum of its proper divisors (60369721).

422587991 is an equidigital number, since it uses as much as digits as its factorization.

422587991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60369720.

The product of its digits is 362880, while the sum is 47.

The square root of 422587991 is about 20556.9450794616. The cubic root of 422587991 is about 750.4222753852.

The spelling of 422587991 in words is "four hundred twenty-two million, five hundred eighty-seven thousand, nine hundred ninety-one".