31190000445 has 48 divisors (see below), whose sum is σ = 55591444272. Its totient is φ = 16165370880.

The previous prime is 31190000423. The next prime is 31190000447. The reversal of 31190000445 is 54400009113.

31190000445 is a `hidden beast` number, since 31 + 190 + 0 + 0 + 0 + 445 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 48692484 + 31141307961 = 6978^2 + 176469^2 .

It is not a de Polignac number, because 31190000445 - 2⁶ = 31190000381 is a prime.

It is a super-2 number, since 2×31190000445² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31190000447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1409265 + ... + 1431225.

It is an arithmetic number, because the mean of its divisors is an integer number (1158155089).

Almost surely, 2^31190000445 is an apocalyptic number.

It is an amenable number.

31190000445 is a deficient number, since it is larger than the sum of its proper divisors (24401443827).

31190000445 is a wasteful number, since it uses less digits than its factorization.

31190000445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22862 (or 22859 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 31190000445 its reverse (54400009113), we get a palindrome (85590009558).

The spelling of 31190000445 in words is "thirty-one billion, one hundred ninety million, four hundred forty-five", and thus it is an aban number.