91551503 has 2 divisors, whose sum is σ = 91551504. Its totient is φ = 91551502.

The previous prime is 91551487. The next prime is 91551517. The reversal of 91551503 is 30515519.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91551503 - 2⁴ = 91551487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91551203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45775751 + 45775752.

It is an arithmetic number, because the mean of its divisors is an integer number (45775752).

Almost surely, 2^91551503 is an apocalyptic number.

91551503 is a deficient number, since it is larger than the sum of its proper divisors (1).

91551503 is an equidigital number, since it uses as much as digits as its factorization.

91551503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3375, while the sum is 29.

The square root of 91551503 is about 9568.2549610679. The cubic root of 91551503 is about 450.7009700755.

The spelling of 91551503 in words is "ninety-one million, five hundred fifty-one thousand, five hundred three".