10005610991 has 4 divisors (see below), whose sum is σ = 10032011400. Its totient is φ = 9979210584.

The previous prime is 10005610987. The next prime is 10005610997. The reversal of 10005610991 is 19901650001.

It is a happy number.

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 10005610991 - 2² = 10005610987 is a prime.

It is a super-2 number, since 2×10005610991² (a number of 21 digits) 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 (10005610997) 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, 13199636 + ... + 13200393.

It is an arithmetic number, because the mean of its divisors is an integer number (2508002850).

Almost surely, 2^10005610991 is an apocalyptic number.

10005610991 is a deficient number, since it is larger than the sum of its proper divisors (26400409).

10005610991 is an equidigital number, since it uses as much as digits as its factorization.

10005610991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26400408.

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

The spelling of 10005610991 in words is "ten billion, five million, six hundred ten thousand, nine hundred ninety-one".