1191471972 has 96 divisors (see below), whose sum is σ = 2916103680. Its totient is φ = 378328320.

The previous prime is 1191471961. The next prime is 1191471973. The reversal of 1191471972 is 2791741911.

It is not an unprimeable number, because it can be changed into a prime (1191471973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6656179 + ... + 6656357.

It is an arithmetic number, because the mean of its divisors is an integer number (30376080).

Almost surely, 2^1191471972 is an apocalyptic number.

1191471972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1191471972 is an abundant number, since it is smaller than the sum of its proper divisors (1724631708).

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

1191471972 is a wasteful number, since it uses less digits than its factorization.

1191471972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473 (or 471 counting only the distinct ones).

The product of its digits is 31752, while the sum is 42.

The square root of 1191471972 is about 34517.7051960295. The cubic root of 1191471972 is about 1060.1352538934.

The spelling of 1191471972 in words is "one billion, one hundred ninety-one million, four hundred seventy-one thousand, nine hundred seventy-two".