1621271167 has 2 divisors, whose sum is σ = 1621271168. Its totient is φ = 1621271166.

The previous prime is 1621271161. The next prime is 1621271189. The reversal of 1621271167 is 7611721261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1621271167 - 2¹⁹ = 1620746879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621271161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810635583 + 810635584.

It is an arithmetic number, because the mean of its divisors is an integer number (810635584).

Almost surely, 2^1621271167 is an apocalyptic number.

1621271167 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621271167 is an equidigital number, since it uses as much as digits as its factorization.

1621271167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 34.

The square root of 1621271167 is about 40265.0116975023. The cubic root of 1621271167 is about 1174.7674003443.

The spelling of 1621271167 in words is "one billion, six hundred twenty-one million, two hundred seventy-one thousand, one hundred sixty-seven".