900149791 has 4 divisors (see below), whose sum is σ = 900219312. Its totient is φ = 900080272.

The previous prime is 900149777. The next prime is 900149819. The reversal of 900149791 is 197941009.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-900149791 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 (900149741) 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 3 ways as a sum of consecutive naturals, for example, 8950 + ... + 43363.

It is an arithmetic number, because the mean of its divisors is an integer number (225054828).

Almost surely, 2^900149791 is an apocalyptic number.

900149791 is a deficient number, since it is larger than the sum of its proper divisors (69521).

900149791 is a wasteful number, since it uses less digits than its factorization.

900149791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69520.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 900149791 is about 30002.4964127987. The cubic root of 900149791 is about 965.5429451974.

The spelling of 900149791 in words is "nine hundred million, one hundred forty-nine thousand, seven hundred ninety-one".