991131062 has 16 divisors (see below), whose sum is σ = 1542629760. Its totient is φ = 477197568.

The previous prime is 991131061. The next prime is 991131073. The reversal of 991131062 is 260131199.

It is a super-2 number, since 2×991131062² = 1964681564122495688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991131061) 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, 61862 + ... + 76217.

It is an arithmetic number, because the mean of its divisors is an integer number (96414360).

Almost surely, 2^991131062 is an apocalyptic number.

991131062 is a deficient number, since it is larger than the sum of its proper divisors (551498698).

991131062 is a wasteful number, since it uses less digits than its factorization.

991131062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138215.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 991131062 is about 31482.2340693922. The cubic root of 991131062 is about 997.0349042299.

The spelling of 991131062 in words is "nine hundred ninety-one million, one hundred thirty-one thousand, sixty-two".