69163981 has 2 divisors, whose sum is σ = 69163982. Its totient is φ = 69163980.

The previous prime is 69163979. The next prime is 69164021. The reversal of 69163981 is 18936196.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68326756 + 837225 = 8266^2 + 915^2 .

It is a cyclic number.

It is not a de Polignac number, because 69163981 - 2¹ = 69163979 is a prime.

It is a super-2 number, since 2×69163981² = 9567312535536722, which contains 22 as substring.

Together with 69163979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69163951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34581990 + 34581991.

It is an arithmetic number, because the mean of its divisors is an integer number (34581991).

Almost surely, 2^69163981 is an apocalyptic number.

It is an amenable number.

69163981 is a deficient number, since it is larger than the sum of its proper divisors (1).

69163981 is an equidigital number, since it uses as much as digits as its factorization.

69163981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The square root of 69163981 is about 8316.4885017656. The cubic root of 69163981 is about 410.4812532516.

The spelling of 69163981 in words is "sixty-nine million, one hundred sixty-three thousand, nine hundred eighty-one".