991194252120 has 48 divisors (see below), whose sum is σ = 3221381320560. Its totient is φ = 264318467136.

The previous prime is 991194252101. The next prime is 991194252163. The reversal of 991194252120 is 21252491199.

991194252120 is a `hidden beast` number, since 9 + 9 + 1 + 1 + 9 + 425 + 212 + 0 = 666.

It is a super-2 number, since 2×991194252120² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1376658324 + ... + 1376659043.

It is an arithmetic number, because the mean of its divisors is an integer number (67112110845).

Almost surely, 2^991194252120 is an apocalyptic number.

991194252120 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

991194252120 is an abundant number, since it is smaller than the sum of its proper divisors (2230187068440).

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

991194252120 is a wasteful number, since it uses less digits than its factorization.

991194252120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2753317384 (or 2753317377 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 991194252120 in words is "nine hundred ninety-one billion, one hundred ninety-four million, two hundred fifty-two thousand, one hundred twenty".