391327081645 has 8 divisors (see below), whose sum is σ = 469685351520. Its totient is φ = 312999762960.

The previous prime is 391327081633. The next prime is 391327081669. The reversal of 391327081645 is 546180723193.

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

It is not a de Polignac number, because 391327081645 - 2¹⁹ = 391326557357 is a prime.

It is a super-3 number, since 3×391327081645³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7709971 + ... + 7760560.

It is an arithmetic number, because the mean of its divisors is an integer number (58710668940).

It is a 2-persistent number, because it is pandigital, and so is 2⋅391327081645 = 782654163290, but 3⋅391327081645 = 1173981244935 is not.

Almost surely, 2^391327081645 is an apocalyptic number.

It is an amenable number.

391327081645 is a deficient number, since it is larger than the sum of its proper divisors (78358269875).

391327081645 is a wasteful number, since it uses less digits than its factorization.

391327081645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15475595.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 391327081645 in words is "three hundred ninety-one billion, three hundred twenty-seven million, eighty-one thousand, six hundred forty-five".