899643537 has 16 divisors (see below), whose sum is σ = 1435329280. Its totient is φ = 553626576.

The previous prime is 899643533. The next prime is 899643541. The reversal of 899643537 is 735346998.

It is an interprime number because it is at equal distance from previous prime (899643533) and next prime (899643541).

It is not a de Polignac number, because 899643537 - 2² = 899643533 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (899643533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1281193 + ... + 1281894.

It is an arithmetic number, because the mean of its divisors is an integer number (89708080).

Almost surely, 2^899643537 is an apocalyptic number.

It is an amenable number.

899643537 is a deficient number, since it is larger than the sum of its proper divisors (535685743).

899643537 is a wasteful number, since it uses less digits than its factorization.

899643537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563109 (or 2563103 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The square root of 899643537 is about 29994.0583616156. The cubic root of 899643537 is about 965.3619006464.

The spelling of 899643537 in words is "eight hundred ninety-nine million, six hundred forty-three thousand, five hundred thirty-seven".