23827097981 has 2 divisors, whose sum is σ = 23827097982. Its totient is φ = 23827097980.

The previous prime is 23827097947. The next prime is 23827098007. The reversal of 23827097981 is 18979072832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22123885081 + 1703212900 = 148741^2 + 41270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23827097981 is a prime.

It is a super-2 number, since 2×23827097981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23827097081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11913548990 + 11913548991.

It is an arithmetic number, because the mean of its divisors is an integer number (11913548991).

Almost surely, 2^23827097981 is an apocalyptic number.

It is an amenable number.

23827097981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23827097981 is an equidigital number, since it uses as much as digits as its factorization.

23827097981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 56.

The spelling of 23827097981 in words is "twenty-three billion, eight hundred twenty-seven million, ninety-seven thousand, nine hundred eighty-one".