31505442045 has 48 divisors (see below), whose sum is σ = 63969507648. Its totient is φ = 13093167360.

The previous prime is 31505442043. The next prime is 31505442061. The reversal of 31505442045 is 54024450513.

It is not a de Polignac number, because 31505442045 - 2¹ = 31505442043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31505441997 and 31505442015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31505442041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1940304 + ... + 1956473.

It is an arithmetic number, because the mean of its divisors is an integer number (1332698076).

Almost surely, 2^31505442045 is an apocalyptic number.

31505442045 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31505442045 is an abundant number, since it is smaller than the sum of its proper divisors (32464065603).

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

31505442045 is a wasteful number, since it uses less digits than its factorization.

31505442045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3896810 (or 3896803 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

Adding to 31505442045 its reverse (54024450513), we get a palindrome (85529892558).

The spelling of 31505442045 in words is "thirty-one billion, five hundred five million, four hundred forty-two thousand, forty-five".