162421691 has 2 divisors, whose sum is σ = 162421692. Its totient is φ = 162421690.

The previous prime is 162421673. The next prime is 162421717. The reversal of 162421691 is 196124261.

It is a weak prime.

It is an emirp because it is prime and its reverse (196124261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 162421691 - 2¹⁰ = 162420667 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (162421661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81210845 + 81210846.

It is an arithmetic number, because the mean of its divisors is an integer number (81210846).

Almost surely, 2^162421691 is an apocalyptic number.

162421691 is a deficient number, since it is larger than the sum of its proper divisors (1).

162421691 is an equidigital number, since it uses as much as digits as its factorization.

162421691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 162421691 is about 12744.4768821635. The cubic root of 162421691 is about 545.6087701278.

The spelling of 162421691 in words is "one hundred sixty-two million, four hundred twenty-one thousand, six hundred ninety-one".