391268761 has 8 divisors (see below), whose sum is σ = 423722880. Its totient is φ = 359151312.

The previous prime is 391268693. The next prime is 391268771. The reversal of 391268761 is 167862193.

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

It is not a de Polignac number, because 391268761 - 2¹⁷ = 391137689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391268771) 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, 81745 + ... + 86398.

It is an arithmetic number, because the mean of its divisors is an integer number (52965360).

Almost surely, 2^391268761 is an apocalyptic number.

It is an amenable number.

391268761 is a deficient number, since it is larger than the sum of its proper divisors (32454119).

391268761 is a wasteful number, since it uses less digits than its factorization.

391268761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168335.

The product of its digits is 108864, while the sum is 43.

The square root of 391268761 is about 19780.5146798560. The cubic root of 391268761 is about 731.4057861187.

The spelling of 391268761 in words is "three hundred ninety-one million, two hundred sixty-eight thousand, seven hundred sixty-one".