899787631 has 4 divisors (see below), whose sum is σ = 900530632. Its totient is φ = 899044632.

The previous prime is 899787619. The next prime is 899787649. The reversal of 899787631 is 136787998.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136787998 = 2 ⋅68393999.

It is a cyclic number.

It is not a de Polignac number, because 899787631 - 2¹⁷ = 899656559 is a prime.

It is a super-2 number, since 2×899787631² = 1619235561801184322, 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 (899787661) 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, 369681 + ... + 372106.

It is an arithmetic number, because the mean of its divisors is an integer number (225132658).

Almost surely, 2^899787631 is an apocalyptic number.

899787631 is a deficient number, since it is larger than the sum of its proper divisors (743001).

899787631 is a wasteful number, since it uses less digits than its factorization.

899787631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743000.

The product of its digits is 4572288, while the sum is 58.

The square root of 899787631 is about 29996.4603078430. The cubic root of 899787631 is about 965.4134378854.

The spelling of 899787631 in words is "eight hundred ninety-nine million, seven hundred eighty-seven thousand, six hundred thirty-one".