991242492 has 12 divisors (see below), whose sum is σ = 2312899176. Its totient is φ = 330414160.

The previous prime is 991242491. The next prime is 991242503. The reversal of 991242492 is 294242199.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991242491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41301759 + ... + 41301782.

It is an arithmetic number, because the mean of its divisors is an integer number (192741598).

Almost surely, 2^991242492 is an apocalyptic number.

It is an amenable number.

991242492 is an abundant number, since it is smaller than the sum of its proper divisors (1321656684).

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

991242492 is a wasteful number, since it uses less digits than its factorization.

991242492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82603548 (or 82603546 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 991242492 is about 31484.0037479352. The cubic root of 991242492 is about 997.0722674137.

The spelling of 991242492 in words is "nine hundred ninety-one million, two hundred forty-two thousand, four hundred ninety-two".