391741489 has 4 divisors (see below), whose sum is σ = 414785124. Its totient is φ = 368697856.

The previous prime is 391741477. The next prime is 391741547. The reversal of 391741489 is 984147193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 984147193 = 25969 ⋅37897.

It can be written as a sum of positive squares in 2 ways, for example, as 302760000 + 88981489 = 17400^2 + 9433^2 .

It is a cyclic number.

It is not a de Polignac number, because 391741489 - 2⁵ = 391741457 is a prime.

It is a super-2 number, since 2×391741489² = 306922788407874242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391741409) 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, 11521792 + ... + 11521825.

It is an arithmetic number, because the mean of its divisors is an integer number (103696281).

Almost surely, 2^391741489 is an apocalyptic number.

It is an amenable number.

391741489 is a deficient number, since it is larger than the sum of its proper divisors (23043635).

391741489 is a wasteful number, since it uses less digits than its factorization.

391741489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23043634.

The product of its digits is 217728, while the sum is 46.

The square root of 391741489 is about 19792.4604079432. The cubic root of 391741489 is about 731.7002272427.

The spelling of 391741489 in words is "three hundred ninety-one million, seven hundred forty-one thousand, four hundred eighty-nine".