401201609 has 2 divisors, whose sum is σ = 401201610. Its totient is φ = 401201608.

The previous prime is 401201599. The next prime is 401201611. The reversal of 401201609 is 906102104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400120009 + 1081600 = 20003^2 + 1040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401201609 is a prime.

Together with 401201611, 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 (401201629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200600804 + 200600805.

It is an arithmetic number, because the mean of its divisors is an integer number (200600805).

Almost surely, 2^401201609 is an apocalyptic number.

It is an amenable number.

401201609 is a deficient number, since it is larger than the sum of its proper divisors (1).

401201609 is an equidigital number, since it uses as much as digits as its factorization.

401201609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 401201609 is about 20030.0176984445. The cubic root of 401201609 is about 737.5433564093.

The spelling of 401201609 in words is "four hundred one million, two hundred one thousand, six hundred nine".