162561779 has 2 divisors, whose sum is σ = 162561780. Its totient is φ = 162561778.

The previous prime is 162561743. The next prime is 162561781. The reversal of 162561779 is 977165261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 162561779 - 2¹² = 162557683 is a prime.

Together with 162561781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (162561379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81280889 + 81280890.

It is an arithmetic number, because the mean of its divisors is an integer number (81280890).

Almost surely, 2^162561779 is an apocalyptic number.

162561779 is a deficient number, since it is larger than the sum of its proper divisors (1).

162561779 is an equidigital number, since it uses as much as digits as its factorization.

162561779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 44.

The square root of 162561779 is about 12749.9717254588. The cubic root of 162561779 is about 545.7655867800.

The spelling of 162561779 in words is "one hundred sixty-two million, five hundred sixty-one thousand, seven hundred seventy-nine".