31120000405 has 32 divisors (see below), whose sum is σ = 40816702080. Its totient is φ = 22640567040.

The previous prime is 31120000393. The next prime is 31120000409. The reversal of 31120000405 is 50400002113.

It is a de Polignac number, because none of the positive numbers 2^k-31120000405 is a prime.

It is a super-3 number, since 3×31120000405³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120000409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1170439 + ... + 1196731.

It is an arithmetic number, because the mean of its divisors is an integer number (1275521940).

Almost surely, 2^31120000405 is an apocalyptic number.

It is an amenable number.

31120000405 is a deficient number, since it is larger than the sum of its proper divisors (9696701675).

31120000405 is a wasteful number, since it uses less digits than its factorization.

31120000405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26581.

The product of its (nonzero) digits is 120, while the sum is 16.

Adding to 31120000405 its reverse (50400002113), we get a palindrome (81520002518).

The spelling of 31120000405 in words is "thirty-one billion, one hundred twenty million, four hundred five", and thus it is an aban number.