10991507 has 4 divisors (see below), whose sum is σ = 11130720. Its totient is φ = 10852296.

The previous prime is 10991501. The next prime is 10991509. The reversal of 10991507 is 70519901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70519901 = 1289 ⋅54709.

It is a cyclic number.

It is not a de Polignac number, because 10991507 - 2¹² = 10987411 is a prime.

It is a super-2 number, since 2×10991507² = 241626452262098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10991501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69488 + ... + 69645.

It is an arithmetic number, because the mean of its divisors is an integer number (2782680).

Almost surely, 2^10991507 is an apocalyptic number.

10991507 is a deficient number, since it is larger than the sum of its proper divisors (139213).

10991507 is an equidigital number, since it uses as much as digits as its factorization.

10991507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139212.

The product of its (nonzero) digits is 2835, while the sum is 32.

The square root of 10991507 is about 3315.3441751951. The cubic root of 10991507 is about 222.3407571595.

The spelling of 10991507 in words is "ten million, nine hundred ninety-one thousand, five hundred seven".