391244413 has 4 divisors (see below), whose sum is σ = 447136480. Its totient is φ = 335352348.

The previous prime is 391244411. The next prime is 391244453. The reversal of 391244413 is 314442193.

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, and also an emirpimes, since its reverse is a distinct semiprime: 314442193 = 13 ⋅24187861.

It is a cyclic number.

It is not a de Polignac number, because 391244413 - 2¹ = 391244411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391244411) 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, 27946023 + ... + 27946036.

It is an arithmetic number, because the mean of its divisors is an integer number (111784120).

Almost surely, 2^391244413 is an apocalyptic number.

It is an amenable number.

391244413 is a deficient number, since it is larger than the sum of its proper divisors (55892067).

391244413 is an equidigital number, since it uses as much as digits as its factorization.

391244413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55892066.

The product of its digits is 10368, while the sum is 31.

The square root of 391244413 is about 19779.8992161234. The cubic root of 391244413 is about 731.3906144181.

The spelling of 391244413 in words is "three hundred ninety-one million, two hundred forty-four thousand, four hundred thirteen".