31393440105 has 16 divisors (see below), whose sum is σ = 50317485504. Its totient is φ = 16713840960.

The previous prime is 31393440103. The next prime is 31393440107. The reversal of 31393440105 is 50104439313.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31393440103) and next prime (31393440107).

It is not a de Polignac number, because 31393440105 - 2¹ = 31393440103 is a prime.

It is a super-2 number, since 2×31393440105² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31393440103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1824094 + ... + 1841223.

It is an arithmetic number, because the mean of its divisors is an integer number (3144842844).

Almost surely, 2^31393440105 is an apocalyptic number.

It is an amenable number.

31393440105 is a deficient number, since it is larger than the sum of its proper divisors (18924045399).

31393440105 is a wasteful number, since it uses less digits than its factorization.

31393440105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3665896.

The product of its (nonzero) digits is 19440, while the sum is 33.

Adding to 31393440105 its reverse (50104439313), we get a palindrome (81497879418).

The spelling of 31393440105 in words is "thirty-one billion, three hundred ninety-three million, four hundred forty thousand, one hundred five".