23691397 has 2 divisors, whose sum is σ = 23691398. Its totient is φ = 23691396.

The previous prime is 23691379. The next prime is 23691419. The reversal of 23691397 is 79319632.

Together with previous prime (23691379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23338561 + 352836 = 4831^2 + 594^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23691397 is a prime.

It is a super-2 number, since 2×23691397² = 1122564583623218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23691307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11845698 + 11845699.

It is an arithmetic number, because the mean of its divisors is an integer number (11845699).

Almost surely, 2^23691397 is an apocalyptic number.

It is an amenable number.

23691397 is a deficient number, since it is larger than the sum of its proper divisors (1).

23691397 is an equidigital number, since it uses as much as digits as its factorization.

23691397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 40.

The square root of 23691397 is about 4867.3809179065. The cubic root of 23691397 is about 287.2082363347.

The spelling of 23691397 in words is "twenty-three million, six hundred ninety-one thousand, three hundred ninety-seven".