1191199012 has 12 divisors (see below), whose sum is σ = 2156481180. Its totient is φ = 575061536.

The previous prime is 1191198991. The next prime is 1191199013. The reversal of 1191199012 is 2109911911.

It can be written as a sum of positive squares in 2 ways, for example, as 681523236 + 509675776 = 26106^2 + 22576^2 .

It is a super-2 number, since 2×1191199012² = 2837910172379552288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1191199013) 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, 5134363 + ... + 5134594.

It is an arithmetic number, because the mean of its divisors is an integer number (179706765).

Almost surely, 2^1191199012 is an apocalyptic number.

It is an amenable number.

1191199012 is a deficient number, since it is larger than the sum of its proper divisors (965282168).

1191199012 is a wasteful number, since it uses less digits than its factorization.

1191199012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10268990 (or 10268988 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 34.

The square root of 1191199012 is about 34513.7510566441. The cubic root of 1191199012 is about 1060.0542905622.

The spelling of 1191199012 in words is "one billion, one hundred ninety-one million, one hundred ninety-nine thousand, twelve".