991150531 has 8 divisors (see below), whose sum is σ = 1133535744. Its totient is φ = 848963400.

The previous prime is 991150529. The next prime is 991150543. The reversal of 991150531 is 135051199.

991150531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 991150531 - 2¹ = 991150529 is a prime.

It is a super-2 number, since 2×991150531² = 1964758750203163922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991150591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38635 + ... + 58948.

It is an arithmetic number, because the mean of its divisors is an integer number (141691968).

Almost surely, 2^991150531 is an apocalyptic number.

991150531 is a deficient number, since it is larger than the sum of its proper divisors (142385213).

991150531 is a wasteful number, since it uses less digits than its factorization.

991150531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99041.

The product of its (nonzero) digits is 6075, while the sum is 34.

The square root of 991150531 is about 31482.5432740114. The cubic root of 991150531 is about 997.0414325106.

The spelling of 991150531 in words is "nine hundred ninety-one million, one hundred fifty thousand, five hundred thirty-one".