391265129 has 8 divisors (see below), whose sum is σ = 405257160. Its totient is φ = 377306496.

The previous prime is 391265113. The next prime is 391265137. The reversal of 391265129 is 921562193.

It can be written as a sum of positive squares in 4 ways, for example, as 48163600 + 343101529 = 6940^2 + 18523^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 391265129 - 2⁴ = 391265113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 391265092 and 391265101.

It is not an unprimeable number, because it can be changed into a prime (391265179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16829 + ... + 32645.

It is an arithmetic number, because the mean of its divisors is an integer number (50657145).

Almost surely, 2^391265129 is an apocalyptic number.

It is an amenable number.

391265129 is a deficient number, since it is larger than the sum of its proper divisors (13992031).

391265129 is a wasteful number, since it uses less digits than its factorization.

391265129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16699.

The product of its digits is 29160, while the sum is 38.

The square root of 391265129 is about 19780.4228721228. The cubic root of 391265129 is about 731.4035229906.

The spelling of 391265129 in words is "three hundred ninety-one million, two hundred sixty-five thousand, one hundred twenty-nine".