10691591 has 2 divisors, whose sum is σ = 10691592. Its totient is φ = 10691590.

The previous prime is 10691587. The next prime is 10691599. The reversal of 10691591 is 19519601.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10691591 - 2² = 10691587 is a prime.

It is a super-2 number, since 2×10691591² = 228620236222562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10691599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5345795 + 5345796.

It is an arithmetic number, because the mean of its divisors is an integer number (5345796).

Almost surely, 2^10691591 is an apocalyptic number.

10691591 is a deficient number, since it is larger than the sum of its proper divisors (1).

10691591 is an equidigital number, since it uses as much as digits as its factorization.

10691591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 10691591 is about 3269.7998409689. The cubic root of 10691591 is about 220.2998047544.

The spelling of 10691591 in words is "ten million, six hundred ninety-one thousand, five hundred ninety-one".