167521897 has 2 divisors, whose sum is σ = 167521898. Its totient is φ = 167521896.

The previous prime is 167521889. The next prime is 167521931. The reversal of 167521897 is 798125761.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153165376 + 14356521 = 12376^2 + 3789^2 .

It is a cyclic number.

It is not a de Polignac number, because 167521897 - 2³ = 167521889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (167521847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83760948 + 83760949.

It is an arithmetic number, because the mean of its divisors is an integer number (83760949).

Almost surely, 2^167521897 is an apocalyptic number.

It is an amenable number.

167521897 is a deficient number, since it is larger than the sum of its proper divisors (1).

167521897 is an equidigital number, since it uses as much as digits as its factorization.

167521897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 46.

The square root of 167521897 is about 12943.0250328121. The cubic root of 167521897 is about 551.2609054426.

The spelling of 167521897 in words is "one hundred sixty-seven million, five hundred twenty-one thousand, eight hundred ninety-seven".