401132391 has 16 divisors (see below), whose sum is σ = 617787648. Its totient is φ = 228809600.

The previous prime is 401132363. The next prime is 401132393. The reversal of 401132391 is 193231104.

It is a cyclic number.

It is not a de Polignac number, because 401132391 - 2⁵ = 401132359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401132393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356955 + ... + 358076.

It is an arithmetic number, because the mean of its divisors is an integer number (38611728).

Almost surely, 2^401132391 is an apocalyptic number.

401132391 is a deficient number, since it is larger than the sum of its proper divisors (216655257).

401132391 is a wasteful number, since it uses less digits than its factorization.

401132391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715062.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 401132391 is about 20028.2897672268. The cubic root of 401132391 is about 737.5009386563.

Adding to 401132391 its reverse (193231104), we get a palindrome (594363495).

The spelling of 401132391 in words is "four hundred one million, one hundred thirty-two thousand, three hundred ninety-one".