391741345 has 4 divisors (see below), whose sum is σ = 470089620. Its totient is φ = 313393072.

The previous prime is 391741333. The next prime is 391741349. The reversal of 391741345 is 543147193.

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

It can be written as a sum of positive squares in 2 ways, for example, as 301091904 + 90649441 = 17352^2 + 9521^2 .

It is a cyclic number.

It is not a de Polignac number, because 391741345 - 2²¹ = 389644193 is a prime.

It is a super-2 number, since 2×391741345² = 306922562764818050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (391741349) 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, 39174130 + ... + 39174139.

It is an arithmetic number, because the mean of its divisors is an integer number (117522405).

Almost surely, 2^391741345 is an apocalyptic number.

It is an amenable number.

391741345 is a deficient number, since it is larger than the sum of its proper divisors (78348275).

391741345 is an equidigital number, since it uses as much as digits as its factorization.

391741345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78348274.

The product of its digits is 45360, while the sum is 37.

The square root of 391741345 is about 19792.4567701940. The cubic root of 391741345 is about 731.7001375876.

The spelling of 391741345 in words is "three hundred ninety-one million, seven hundred forty-one thousand, three hundred forty-five".