167880721 has 2 divisors, whose sum is σ = 167880722. Its totient is φ = 167880720.

The previous prime is 167880701. The next prime is 167880731. The reversal of 167880721 is 127088761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104837121 + 63043600 = 10239^2 + 7940^2 .

It is a cyclic number.

It is not a de Polignac number, because 167880721 - 2¹⁹ = 167356433 is a prime.

It is not a weakly prime, because it can be changed into another prime (167880701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83940360 + 83940361.

It is an arithmetic number, because the mean of its divisors is an integer number (83940361).

Almost surely, 2^167880721 is an apocalyptic number.

It is an amenable number.

167880721 is a deficient number, since it is larger than the sum of its proper divisors (1).

167880721 is an equidigital number, since it uses as much as digits as its factorization.

167880721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 40.

The square root of 167880721 is about 12956.8792924840. The cubic root of 167880721 is about 551.6542163756.

The spelling of 167880721 in words is "one hundred sixty-seven million, eight hundred eighty thousand, seven hundred twenty-one".