91125031 has 2 divisors, whose sum is σ = 91125032. Its totient is φ = 91125030.

The previous prime is 91125017. The next prime is 91125059. The reversal of 91125031 is 13052119.

It is a weak prime.

It is an emirp because it is prime and its reverse (13052119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91125031 - 2¹⁵ = 91092263 is a prime.

It is a super-2 number, since 2×91125031² = 16607542549501922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91124993 and 91125011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91125071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45562515 + 45562516.

It is an arithmetic number, because the mean of its divisors is an integer number (45562516).

Almost surely, 2^91125031 is an apocalyptic number.

91125031 is a deficient number, since it is larger than the sum of its proper divisors (1).

91125031 is an equidigital number, since it uses as much as digits as its factorization.

91125031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 91125031 is about 9545.9431697449. The cubic root of 91125031 is about 450.0000510288. Note that the first 4 decimals are identical.

The spelling of 91125031 in words is "ninety-one million, one hundred twenty-five thousand, thirty-one".