391946901 has 4 divisors (see below), whose sum is σ = 522595872. Its totient is φ = 261297932.

The previous prime is 391946881. The next prime is 391946911. The reversal of 391946901 is 109649193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 391946901 - 2⁷ = 391946773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391946911) 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, 65324481 + ... + 65324486.

It is an arithmetic number, because the mean of its divisors is an integer number (130648968).

Almost surely, 2^391946901 is an apocalyptic number.

It is an amenable number.

391946901 is a deficient number, since it is larger than the sum of its proper divisors (130648971).

391946901 is a wasteful number, since it uses less digits than its factorization.

391946901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130648970.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 391946901 is about 19797.6488755610. The cubic root of 391946901 is about 731.8280953638.

The spelling of 391946901 in words is "three hundred ninety-one million, nine hundred forty-six thousand, nine hundred one".