91031069 has 4 divisors (see below), whose sum is σ = 92053980. Its totient is φ = 90008160.

The previous prime is 91031027. The next prime is 91031077. The reversal of 91031069 is 96013019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96013019 = 1297 ⋅74027.

It can be written as a sum of positive squares in 2 ways, for example, as 45738169 + 45292900 = 6763^2 + 6730^2 .

It is a cyclic number.

It is not a de Polignac number, because 91031069 - 2⁸ = 91030813 is a prime.

It is a super-2 number, since 2×91031069² = 16573311046565522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91031009) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 511322 + ... + 511499.

It is an arithmetic number, because the mean of its divisors is an integer number (23013495).

Almost surely, 2^91031069 is an apocalyptic number.

It is an amenable number.

91031069 is a deficient number, since it is larger than the sum of its proper divisors (1022911).

91031069 is a wasteful number, since it uses less digits than its factorization.

91031069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022910.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 91031069 is about 9541.0203332767. The cubic root of 91031069 is about 449.8453279128.

The spelling of 91031069 in words is "ninety-one million, thirty-one thousand, sixty-nine".