991337527 has 2 divisors, whose sum is σ = 991337528. Its totient is φ = 991337526.

The previous prime is 991337491. The next prime is 991337531. The reversal of 991337527 is 725733199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991337527 - 2²⁷ = 857119799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991337227) 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, 495668763 + 495668764.

It is an arithmetic number, because the mean of its divisors is an integer number (495668764).

Almost surely, 2^991337527 is an apocalyptic number.

991337527 is a deficient number, since it is larger than the sum of its proper divisors (1).

991337527 is an equidigital number, since it uses as much as digits as its factorization.

991337527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 357210, while the sum is 46.

The square root of 991337527 is about 31485.5129702535. The cubic root of 991337527 is about 997.1041310379.

The spelling of 991337527 in words is "nine hundred ninety-one million, three hundred thirty-seven thousand, five hundred twenty-seven".