393709661231 has 4 divisors (see below), whose sum is σ = 393758269464. Its totient is φ = 393661053000.

The previous prime is 393709661197. The next prime is 393709661249. The reversal of 393709661231 is 132166907393.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 393709661231 - 2¹⁸ = 393709399087 is a prime.

It is a super-2 number, since 2×393709661231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 393709661231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393709660231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24291965 + ... + 24308166.

It is an arithmetic number, because the mean of its divisors is an integer number (98439567366).

Almost surely, 2^393709661231 is an apocalyptic number.

393709661231 is a deficient number, since it is larger than the sum of its proper divisors (48608233).

393709661231 is an equidigital number, since it uses as much as digits as its factorization.

393709661231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48608232.

The product of its (nonzero) digits is 1102248, while the sum is 50.

The spelling of 393709661231 in words is "three hundred ninety-three billion, seven hundred nine million, six hundred sixty-one thousand, two hundred thirty-one".