391620097 has 8 divisors (see below), whose sum is σ = 429460992. Its totient is φ = 354152400.

The previous prime is 391620091. The next prime is 391620101. The reversal of 391620097 is 790026193.

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 391620097 - 2¹¹ = 391618049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391620091) 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, 91098 + ... + 95299.

It is an arithmetic number, because the mean of its divisors is an integer number (53682624).

Almost surely, 2^391620097 is an apocalyptic number.

It is an amenable number.

391620097 is a deficient number, since it is larger than the sum of its proper divisors (37840895).

391620097 is a wasteful number, since it uses less digits than its factorization.

391620097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186599.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 391620097 is about 19789.3935480600. The cubic root of 391620097 is about 731.6246402099.

The spelling of 391620097 in words is "three hundred ninety-one million, six hundred twenty thousand, ninety-seven".