1172961591 has 16 divisors (see below), whose sum is σ = 1586891520. Its totient is φ = 770523840.

The previous prime is 1172961577. The next prime is 1172961593. The reversal of 1172961591 is 1951692711.

It is a happy number.

It is not a de Polignac number, because 1172961591 - 2⁹ = 1172961079 is a prime.

It is a super-2 number, since 2×1172961591² = 2751677787922502562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172961593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 317686 + ... + 321356.

It is an arithmetic number, because the mean of its divisors is an integer number (99180720).

Almost surely, 2^1172961591 is an apocalyptic number.

1172961591 is a deficient number, since it is larger than the sum of its proper divisors (413929929).

1172961591 is a wasteful number, since it uses less digits than its factorization.

1172961591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5206.

The product of its digits is 34020, while the sum is 42.

The square root of 1172961591 is about 34248.5268442308. The cubic root of 1172961591 is about 1054.6165856654.

The spelling of 1172961591 in words is "one billion, one hundred seventy-two million, nine hundred sixty-one thousand, five hundred ninety-one".