91003961 has 2 divisors, whose sum is σ = 91003962. Its totient is φ = 91003960.

The previous prime is 91003949. The next prime is 91003967. The reversal of 91003961 is 16930019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45697600 + 45306361 = 6760^2 + 6731^2 .

It is a cyclic number.

It is not a de Polignac number, because 91003961 - 2²⁶ = 23895097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91003967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45501980 + 45501981.

It is an arithmetic number, because the mean of its divisors is an integer number (45501981).

Almost surely, 2^91003961 is an apocalyptic number.

It is an amenable number.

91003961 is a deficient number, since it is larger than the sum of its proper divisors (1).

91003961 is an equidigital number, since it uses as much as digits as its factorization.

91003961 is an evil number, because the sum of its binary digits is even.

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

The square root of 91003961 is about 9539.5996247222. The cubic root of 91003961 is about 449.8006705669.

The spelling of 91003961 in words is "ninety-one million, three thousand, nine hundred sixty-one".