2287656991 has 16 divisors (see below), whose sum is σ = 2401947648. Its totient is φ = 2176977600.

The previous prime is 2287656989. The next prime is 2287657049. The reversal of 2287656991 is 1996567822.

It is a cyclic number.

It is not a de Polignac number, because 2287656991 - 2¹ = 2287656989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2287656691) 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, 238906 + ... + 248296.

It is an arithmetic number, because the mean of its divisors is an integer number (150121728).

Almost surely, 2^2287656991 is an apocalyptic number.

2287656991 is a deficient number, since it is larger than the sum of its proper divisors (114290657).

2287656991 is an equidigital number, since it uses as much as digits as its factorization.

2287656991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9582.

The product of its digits is 3265920, while the sum is 55.

The square root of 2287656991 is about 47829.4573563197. The cubic root of 2287656991 is about 1317.6406029589.

The spelling of 2287656991 in words is "two billion, two hundred eighty-seven million, six hundred fifty-six thousand, nine hundred ninety-one".