401945191 has 4 divisors (see below), whose sum is σ = 415805400. Its totient is φ = 388084984.

The previous prime is 401945189. The next prime is 401945197. The reversal of 401945191 is 191549104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401945191 - 2¹ = 401945189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401945197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6930061 + ... + 6930118.

It is an arithmetic number, because the mean of its divisors is an integer number (103951350).

Almost surely, 2^401945191 is an apocalyptic number.

401945191 is a deficient number, since it is larger than the sum of its proper divisors (13860209).

401945191 is a wasteful number, since it uses less digits than its factorization.

401945191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13860208.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 401945191 is about 20048.5707969421. The cubic root of 401945191 is about 737.9987263830.

The spelling of 401945191 in words is "four hundred one million, nine hundred forty-five thousand, one hundred ninety-one".