31145445436 has 24 divisors (see below), whose sum is σ = 62469394400. Its totient is φ = 13309797312.

The previous prime is 31145445421. The next prime is 31145445439. The reversal of 31145445436 is 63454454113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31145445439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1583835 + ... + 1603378.

Almost surely, 2^31145445436 is an apocalyptic number.

It is an amenable number.

31145445436 is an abundant number, since it is smaller than the sum of its proper divisors (31323948964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31145445436 is a wasteful number, since it uses less digits than its factorization.

31145445436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3187573 (or 3187571 counting only the distinct ones).

The product of its digits is 345600, while the sum is 40.

Adding to 31145445436 its reverse (63454454113), we get a palindrome (94599899549).

The spelling of 31145445436 in words is "thirty-one billion, one hundred forty-five million, four hundred forty-five thousand, four hundred thirty-six".