31231445340 has 24 divisors (see below), whose sum is σ = 87448047120. Its totient is φ = 8328385408.

The previous prime is 31231445299. The next prime is 31231445353. The reversal of 31231445340 is 4354413213.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 31231445298 and 31231445307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260261985 + ... + 260262104.

It is an arithmetic number, because the mean of its divisors is an integer number (3643668630).

Almost surely, 2^31231445340 is an apocalyptic number.

31231445340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31231445340 is an abundant number, since it is smaller than the sum of its proper divisors (56216601780).

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

31231445340 is a wasteful number, since it uses less digits than its factorization.

31231445340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520524101 (or 520524099 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 31231445340 its reverse (4354413213), we get a palindrome (35585858553).

The spelling of 31231445340 in words is "thirty-one billion, two hundred thirty-one million, four hundred forty-five thousand, three hundred forty".