167540981 has 2 divisors, whose sum is σ = 167540982. Its totient is φ = 167540980.

The previous prime is 167540977. The next prime is 167541007. The reversal of 167540981 is 189045761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90820900 + 76720081 = 9530^2 + 8759^2 .

It is an emirp because it is prime and its reverse (189045761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 167540981 - 2² = 167540977 is a prime.

It is a super-2 number, since 2×167540981² = 56139960628884722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167540941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83770490 + 83770491.

It is an arithmetic number, because the mean of its divisors is an integer number (83770491).

Almost surely, 2^167540981 is an apocalyptic number.

It is an amenable number.

167540981 is a deficient number, since it is larger than the sum of its proper divisors (1).

167540981 is an equidigital number, since it uses as much as digits as its factorization.

167540981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 167540981 is about 12943.7622428720. The cubic root of 167540981 is about 551.2818377582.

The spelling of 167540981 in words is "one hundred sixty-seven million, five hundred forty thousand, nine hundred eighty-one".