10997581 has 16 divisors (see below), whose sum is σ = 12925440. Its totient is φ = 9163440.

The previous prime is 10997579. The next prime is 10997593. The reversal of 10997581 is 18579901.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 10997581 - 2¹ = 10997579 is a prime.

It is a super-2 number, since 2×10997581² = 241893575703122, 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 (10997501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61350 + ... + 61528.

It is an arithmetic number, because the mean of its divisors is an integer number (807840).

Almost surely, 2^10997581 is an apocalyptic number.

It is an amenable number.

10997581 is a deficient number, since it is larger than the sum of its proper divisors (1927859).

10997581 is a wasteful number, since it uses less digits than its factorization.

10997581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 10997581 is about 3316.2600923329. The cubic root of 10997581 is about 222.3817054138.

The spelling of 10997581 in words is "ten million, nine hundred ninety-seven thousand, five hundred eighty-one".