2167625981 has 2 divisors, whose sum is σ = 2167625982. Its totient is φ = 2167625980.

The previous prime is 2167625969. The next prime is 2167625983. The reversal of 2167625981 is 1895267612.

It is a happy number.

2167625981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1805485081 + 362140900 = 42491^2 + 19030^2 .

It is a cyclic number.

It is not a de Polignac number, because 2167625981 - 2¹⁰ = 2167624957 is a prime.

It is a super-2 number, since 2×2167625981² = 9397204787012424722, which contains 22 as substring.

Together with 2167625983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2167625983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083812990 + 1083812991.

It is an arithmetic number, because the mean of its divisors is an integer number (1083812991).

Almost surely, 2^2167625981 is an apocalyptic number.

It is an amenable number.

2167625981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2167625981 is an equidigital number, since it uses as much as digits as its factorization.

2167625981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 2167625981 is about 46557.7703611331. The cubic root of 2167625981 is about 1294.1802937042.

The spelling of 2167625981 in words is "two billion, one hundred sixty-seven million, six hundred twenty-five thousand, nine hundred eighty-one".