991941252 has 48 divisors (see below), whose sum is σ = 2369640000. Its totient is φ = 322853760.

The previous prime is 991941221. The next prime is 991941257. The reversal of 991941252 is 252149199.

It is not an unprimeable number, because it can be changed into a prime (991941257) 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, 96874 + ... + 106622.

It is an arithmetic number, because the mean of its divisors is an integer number (49367500).

Almost surely, 2^991941252 is an apocalyptic number.

It is an amenable number.

991941252 is an abundant number, since it is smaller than the sum of its proper divisors (1377698748).

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

991941252 is a wasteful number, since it uses less digits than its factorization.

991941252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9956 (or 9954 counting only the distinct ones).

The product of its digits is 58320, while the sum is 42.

The square root of 991941252 is about 31495.0988568063. The cubic root of 991941252 is about 997.3065022503.

The spelling of 991941252 in words is "nine hundred ninety-one million, nine hundred forty-one thousand, two hundred fifty-two".