91038487 has 2 divisors, whose sum is σ = 91038488. Its totient is φ = 91038486.

The previous prime is 91038457. The next prime is 91038499. The reversal of 91038487 is 78483019.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91038487 - 2⁷ = 91038359 is a prime.

It is a super-2 number, since 2×91038487² = 16576012230498338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91038407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45519243 + 45519244.

It is an arithmetic number, because the mean of its divisors is an integer number (45519244).

Almost surely, 2^91038487 is an apocalyptic number.

91038487 is a deficient number, since it is larger than the sum of its proper divisors (1).

91038487 is an equidigital number, since it uses as much as digits as its factorization.

91038487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 91038487 is about 9541.4090678474. The cubic root of 91038487 is about 449.8575466789.

The spelling of 91038487 in words is "ninety-one million, thirty-eight thousand, four hundred eighty-seven".