899743631 has 4 divisors (see below), whose sum is σ = 909853200. Its totient is φ = 889634064.

The previous prime is 899743619. The next prime is 899743639. The reversal of 899743631 is 136347998.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-899743631 is a prime.

It is a super-2 number, since 2×899743631² = 1619077203050128322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 899743631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899743639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5054651 + ... + 5054828.

It is an arithmetic number, because the mean of its divisors is an integer number (227463300).

Almost surely, 2^899743631 is an apocalyptic number.

899743631 is a deficient number, since it is larger than the sum of its proper divisors (10109569).

899743631 is a wasteful number, since it uses less digits than its factorization.

899743631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10109568.

The product of its digits is 979776, while the sum is 50.

The square root of 899743631 is about 29995.7268790073. The cubic root of 899743631 is about 965.3977012522.

The spelling of 899743631 in words is "eight hundred ninety-nine million, seven hundred forty-three thousand, six hundred thirty-one".