91903772087 has 2 divisors, whose sum is σ = 91903772088. Its totient is φ = 91903772086.

The previous prime is 91903772053. The next prime is 91903772099. The reversal of 91903772087 is 78027730919.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91903772087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91903772287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45951886043 + 45951886044.

It is an arithmetic number, because the mean of its divisors is an integer number (45951886044).

Almost surely, 2^91903772087 is an apocalyptic number.

91903772087 is a deficient number, since it is larger than the sum of its proper divisors (1).

91903772087 is an equidigital number, since it uses as much as digits as its factorization.

91903772087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The spelling of 91903772087 in words is "ninety-one billion, nine hundred three million, seven hundred seventy-two thousand, eighty-seven".