427556991 has 16 divisors (see below), whose sum is σ = 598120448. Its totient is φ = 271317600.

The previous prime is 427556963. The next prime is 427556999. The reversal of 427556991 is 199655724.

It is not a de Polignac number, because 427556991 - 2²⁵ = 394002559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 427556991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427556999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32011 + ... + 43356.

It is an arithmetic number, because the mean of its divisors is an integer number (37382528).

Almost surely, 2^427556991 is an apocalyptic number.

427556991 is a deficient number, since it is larger than the sum of its proper divisors (170563457).

427556991 is a wasteful number, since it uses less digits than its factorization.

427556991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75462.

The product of its digits is 680400, while the sum is 48.

The square root of 427556991 is about 20677.4512694384. The cubic root of 427556991 is about 753.3521013458.

The spelling of 427556991 in words is "four hundred twenty-seven million, five hundred fifty-six thousand, nine hundred ninety-one".