1169620991 has 32 divisors (see below), whose sum is σ = 1508474880. Its totient is φ = 880495200.

The previous prime is 1169620967. The next prime is 1169621003. The reversal of 1169620991 is 1990269611.

It is a cyclic number.

It is not a de Polignac number, because 1169620991 - 2²⁶ = 1102512127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1169620931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 283856 + ... + 287946.

It is an arithmetic number, because the mean of its divisors is an integer number (47139840).

Almost surely, 2^1169620991 is an apocalyptic number.

1169620991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1169620991 is a deficient number, since it is larger than the sum of its proper divisors (338853889).

1169620991 is a wasteful number, since it uses less digits than its factorization.

1169620991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4235.

The product of its (nonzero) digits is 52488, while the sum is 44.

The square root of 1169620991 is about 34199.7220895141. The cubic root of 1169620991 is about 1053.6144494058.

The spelling of 1169620991 in words is "one billion, one hundred sixty-nine million, six hundred twenty thousand, nine hundred ninety-one".