10537991 has 4 divisors (see below), whose sum is σ = 10901400. Its totient is φ = 10174584.

The previous prime is 10537987. The next prime is 10538009. The reversal of 10537991 is 19973501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10537991 - 2² = 10537987 is a prime.

It is a super-2 number, since 2×10537991² = 222098508632162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10537981) 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, 181661 + ... + 181718.

It is an arithmetic number, because the mean of its divisors is an integer number (2725350).

Almost surely, 2^10537991 is an apocalyptic number.

10537991 is a deficient number, since it is larger than the sum of its proper divisors (363409).

10537991 is an equidigital number, since it uses as much as digits as its factorization.

10537991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363408.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 10537991 is about 3246.2271947601. The cubic root of 10537991 is about 219.2397380204.

The spelling of 10537991 in words is "ten million, five hundred thirty-seven thousand, nine hundred ninety-one".