991539414 has 32 divisors (see below), whose sum is σ = 2229978240. Its totient is φ = 326529576.

The previous prime is 991539413. The next prime is 991539469. The reversal of 991539414 is 414935199.

It is a self number, because there is not a number n which added to its sum of digits gives 991539414.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991539413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106132 + ... + 115095.

It is an arithmetic number, because the mean of its divisors is an integer number (69686820).

Almost surely, 2^991539414 is an apocalyptic number.

991539414 is an abundant number, since it is smaller than the sum of its proper divisors (1238438826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991539414 is a wasteful number, since it uses less digits than its factorization.

991539414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221321 (or 221315 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 991539414 is about 31488.7188370693. The cubic root of 991539414 is about 997.1718135687.

The spelling of 991539414 in words is "nine hundred ninety-one million, five hundred thirty-nine thousand, four hundred fourteen".