1191487970 has 16 divisors (see below), whose sum is σ = 2145157560. Its totient is φ = 476488704.

The previous prime is 1191487963. The next prime is 1191488059. The reversal of 1191487970 is 797841911.

It can be written as a sum of positive squares in 4 ways, for example, as 752459761 + 439028209 = 27431^2 + 20953^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 46466 + ... + 67394.

Almost surely, 2^1191487970 is an apocalyptic number.

1191487970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1191487970 is a deficient number, since it is larger than the sum of its proper divisors (953669590).

1191487970 is a wasteful number, since it uses less digits than its factorization.

1191487970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26629.

The product of its (nonzero) digits is 127008, while the sum is 47.

The square root of 1191487970 is about 34517.9369313984. The cubic root of 1191487970 is about 1060.1399987156.

The spelling of 1191487970 in words is "one billion, one hundred ninety-one million, four hundred eighty-seven thousand, nine hundred seventy".