391621706461 has 8 divisors (see below), whose sum is σ = 393159960000. Its totient is φ = 390086467680.

The previous prime is 391621706447. The next prime is 391621706519. The reversal of 391621706461 is 164607126193.

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 391621706461 - 2¹³ = 391621698269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391621706431) 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, 493201 + ... + 1013158.

It is an arithmetic number, because the mean of its divisors is an integer number (49144995000).

Almost surely, 2^391621706461 is an apocalyptic number.

It is an amenable number.

391621706461 is a deficient number, since it is larger than the sum of its proper divisors (1538253539).

391621706461 is a wasteful number, since it uses less digits than its factorization.

391621706461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507379.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 391621706461 in words is "three hundred ninety-one billion, six hundred twenty-one million, seven hundred six thousand, four hundred sixty-one".