162179821 has 2 divisors, whose sum is σ = 162179822. Its totient is φ = 162179820.

The previous prime is 162179807. The next prime is 162179837. The reversal of 162179821 is 128971261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86750596 + 75429225 = 9314^2 + 8685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-162179821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162179891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81089910 + 81089911.

It is an arithmetic number, because the mean of its divisors is an integer number (81089911).

Almost surely, 2^162179821 is an apocalyptic number.

It is an amenable number.

162179821 is a deficient number, since it is larger than the sum of its proper divisors (1).

162179821 is an equidigital number, since it uses as much as digits as its factorization.

162179821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 37.

The square root of 162179821 is about 12734.9841381919. The cubic root of 162179821 is about 545.3378047731.

The spelling of 162179821 in words is "one hundred sixty-two million, one hundred seventy-nine thousand, eight hundred twenty-one".