401183921 has 2 divisors, whose sum is σ = 401183922. Its totient is φ = 401183920.

The previous prime is 401183899. The next prime is 401183947. The reversal of 401183921 is 129381104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400600225 + 583696 = 20015^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 401183921 - 2⁶ = 401183857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (401183971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200591960 + 200591961.

It is an arithmetic number, because the mean of its divisors is an integer number (200591961).

Almost surely, 2^401183921 is an apocalyptic number.

It is an amenable number.

401183921 is a deficient number, since it is larger than the sum of its proper divisors (1).

401183921 is an equidigital number, since it uses as much as digits as its factorization.

401183921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 401183921 is about 20029.5761562745. The cubic root of 401183921 is about 737.5325174210.

The spelling of 401183921 in words is "four hundred one million, one hundred eighty-three thousand, nine hundred twenty-one".