31231154521242 has 48 divisors (see below), whose sum is σ = 72877225843968. Its totient is φ = 9608988385440.

The previous prime is 31231154521187. The next prime is 31231154521253. The reversal of 31231154521242 is 24212545113213.

31231154521242 is a `hidden beast` number, since 3 + 1 + 2 + 311 + 54 + 52 + 1 + 242 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 31231154521197 and 31231154521206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 372118 + ... + 7912065.

It is an arithmetic number, because the mean of its divisors is an integer number (1518275538416).

Almost surely, 2^{31231154521242} is an apocalyptic number.

31231154521242 is an abundant number, since it is smaller than the sum of its proper divisors (41646071322726).

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

31231154521242 is a wasteful number, since it uses less digits than its factorization.

31231154521242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8300315 (or 8300312 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

Adding to 31231154521242 its reverse (24212545113213), we get a palindrome (55443699634455).

The spelling of 31231154521242 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred fifty-four million, five hundred twenty-one thousand, two hundred forty-two".