1231822887 has 16 divisors (see below), whose sum is σ = 1649813088. Its totient is φ = 817534080.

The previous prime is 1231822861. The next prime is 1231822903. The reversal of 1231822887 is 7882281321.

It is not a de Polignac number, because 1231822887 - 2¹⁰ = 1231821863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231822087) 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, 847053 + ... + 848505.

It is an arithmetic number, because the mean of its divisors is an integer number (103113318).

Almost surely, 2^1231822887 is an apocalyptic number.

1231822887 is a deficient number, since it is larger than the sum of its proper divisors (417990201).

1231822887 is a wasteful number, since it uses less digits than its factorization.

1231822887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530.

The product of its digits is 86016, while the sum is 42.

The square root of 1231822887 is about 35097.3344714381. The cubic root of 1231822887 is about 1071.9703082549.

The spelling of 1231822887 in words is "one billion, two hundred thirty-one million, eight hundred twenty-two thousand, eight hundred eighty-seven".