391362081 has 8 divisors (see below), whose sum is σ = 569253984. Its totient is φ = 237189120.

The previous prime is 391362079. The next prime is 391362109. The reversal of 391362081 is 180263193.

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

It is not a de Polignac number, because 391362081 - 2¹ = 391362079 is a prime.

It is a super-2 number, since 2×391362081² = 306328556889301122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 11859457 = 391362081 / (3 + 9 + 1 + 3 + 6 + 2 + 0 + 8 + 1).

It is not an unprimeable number, because it can be changed into a prime (391362071) 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, 5929696 + ... + 5929761.

It is an arithmetic number, because the mean of its divisors is an integer number (71156748).

Almost surely, 2^391362081 is an apocalyptic number.

It is an amenable number.

391362081 is a deficient number, since it is larger than the sum of its proper divisors (177891903).

391362081 is a wasteful number, since it uses less digits than its factorization.

391362081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11859471.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 391362081 is about 19782.8734262746. The cubic root of 391362081 is about 731.4639297522.

The spelling of 391362081 in words is "three hundred ninety-one million, three hundred sixty-two thousand, eighty-one".