391628159 has 4 divisors (see below), whose sum is σ = 421753416. Its totient is φ = 361502904.

The previous prime is 391628147. The next prime is 391628161. The reversal of 391628159 is 951826193.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 391628159 - 2¹² = 391624063 is a prime.

It is a super-2 number, since 2×391628159² = 306745229843458562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391628129) 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, 15062609 + ... + 15062634.

It is an arithmetic number, because the mean of its divisors is an integer number (105438354).

Almost surely, 2^391628159 is an apocalyptic number.

391628159 is a deficient number, since it is larger than the sum of its proper divisors (30125257).

391628159 is a wasteful number, since it uses less digits than its factorization.

391628159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30125256.

The product of its digits is 116640, while the sum is 44.

The square root of 391628159 is about 19789.5972419855. The cubic root of 391628159 is about 731.6296606514.

The spelling of 391628159 in words is "three hundred ninety-one million, six hundred twenty-eight thousand, one hundred fifty-nine".