162561901 has 2 divisors, whose sum is σ = 162561902. Its totient is φ = 162561900.

The previous prime is 162561869. The next prime is 162561911. The reversal of 162561901 is 109165261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83814025 + 78747876 = 9155^2 + 8874^2 .

It is a cyclic number.

It is not a de Polignac number, because 162561901 - 2⁵ = 162561869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162561911) 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, 81280950 + 81280951.

It is an arithmetic number, because the mean of its divisors is an integer number (81280951).

Almost surely, 2^162561901 is an apocalyptic number.

It is an amenable number.

162561901 is a deficient number, since it is larger than the sum of its proper divisors (1).

162561901 is an equidigital number, since it uses as much as digits as its factorization.

162561901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 162561901 is about 12749.9765097823. The cubic root of 162561901 is about 545.7657233094.

The spelling of 162561901 in words is "one hundred sixty-two million, five hundred sixty-one thousand, nine hundred one".