391112401 has 4 divisors (see below), whose sum is σ = 408117312. Its totient is φ = 374107492.

The previous prime is 391112363. The next prime is 391112413. The reversal of 391112401 is 104211193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 391112401 - 2¹³ = 391104209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391112431) 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, 8502421 + ... + 8502466.

It is an arithmetic number, because the mean of its divisors is an integer number (102029328).

Almost surely, 2^391112401 is an apocalyptic number.

It is an amenable number.

391112401 is a deficient number, since it is larger than the sum of its proper divisors (17004911).

391112401 is a wasteful number, since it uses less digits than its factorization.

391112401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17004910.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 391112401 is about 19776.5619105041. The cubic root of 391112401 is about 731.3083442770.

Adding to 391112401 its reverse (104211193), we get a palindrome (495323594).

The spelling of 391112401 in words is "three hundred ninety-one million, one hundred twelve thousand, four hundred one".