1191660481 has 8 divisors (see below), whose sum is σ = 1300710528. Its totient is φ = 1082730000.

The previous prime is 1191660479. The next prime is 1191660497. The reversal of 1191660481 is 1840661911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1191660481 - 2¹ = 1191660479 is a prime.

It is a super-2 number, since 2×1191660481² = 2840109403954302722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1191660481.

It is not an unprimeable number, because it can be changed into a prime (1191660451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8370 + ... + 49531.

It is an arithmetic number, because the mean of its divisors is an integer number (162588816).

Almost surely, 2^1191660481 is an apocalyptic number.

1191660481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1191660481 is a deficient number, since it is larger than the sum of its proper divisors (109050047).

1191660481 is a wasteful number, since it uses less digits than its factorization.

1191660481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59783.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1191660481 is about 34520.4357011901. The cubic root of 1191660481 is about 1060.1911607891.

The spelling of 1191660481 in words is "one billion, one hundred ninety-one million, six hundred sixty thousand, four hundred eighty-one".