975081891 has 16 divisors (see below), whose sum is σ = 1493312000. Its totient is φ = 554387328.

The previous prime is 975081871. The next prime is 975081907. The reversal of 975081891 is 198180579.

975081891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 975081891 - 2⁷ = 975081763 is a prime.

It is a super-2 number, since 2×975081891² = 1901569388312271762, 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 975081891.

It is not an unprimeable number, because it can be changed into a prime (975081841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112486 + ... + 120843.

It is an arithmetic number, because the mean of its divisors is an integer number (93332000).

Almost surely, 2^975081891 is an apocalyptic number.

975081891 is a deficient number, since it is larger than the sum of its proper divisors (518230109).

975081891 is a wasteful number, since it uses less digits than its factorization.

975081891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233538.

The product of its (nonzero) digits is 181440, while the sum is 48.

The square root of 975081891 is about 31226.3012699231. The cubic root of 975081891 is about 991.6240022069.

It can be divided in two parts, 97508 and 1891, that added together give a palindrome (99399).

The spelling of 975081891 in words is "nine hundred seventy-five million, eighty-one thousand, eight hundred ninety-one".