22497661 has 4 divisors (see below), whose sum is σ = 23223424. Its totient is φ = 21771900.

The previous prime is 22497637. The next prime is 22497677. The reversal of 22497661 is 16679422.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16679422 = 2 ⋅8339711.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22497661 is a prime.

It is a super-2 number, since 2×22497661² = 1012289500941842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22497661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22407661) 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, 362835 + ... + 362896.

It is an arithmetic number, because the mean of its divisors is an integer number (5805856).

Almost surely, 2^22497661 is an apocalyptic number.

It is an amenable number.

22497661 is a deficient number, since it is larger than the sum of its proper divisors (725763).

22497661 is an equidigital number, since it uses as much as digits as its factorization.

22497661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725762.

The product of its digits is 36288, while the sum is 37.

The square root of 22497661 is about 4743.1699315964. The cubic root of 22497661 is about 282.3010257330.

The spelling of 22497661 in words is "twenty-two million, four hundred ninety-seven thousand, six hundred sixty-one".