31382440381 has 4 divisors (see below), whose sum is σ = 31590271264. Its totient is φ = 31174609500.

The previous prime is 31382440379. The next prime is 31382440403. The reversal of 31382440381 is 18304428313.

It is a happy number.

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 31382440381 - 2¹ = 31382440379 is a prime.

It is a super-2 number, since 2×31382440381² (a number of 22 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 31382440381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31382440681) 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, 103915215 + ... + 103915516.

It is an arithmetic number, because the mean of its divisors is an integer number (7897567816).

Almost surely, 2^31382440381 is an apocalyptic number.

It is an amenable number.

31382440381 is a deficient number, since it is larger than the sum of its proper divisors (207830883).

31382440381 is a wasteful number, since it uses less digits than its factorization.

31382440381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207830882.

The product of its (nonzero) digits is 55296, while the sum is 37.

Adding to 31382440381 its reverse (18304428313), we get a palindrome (49686868694).

The spelling of 31382440381 in words is "thirty-one billion, three hundred eighty-two million, four hundred forty thousand, three hundred eighty-one".