31542420331 has 8 divisors (see below), whose sum is σ = 32020782480. Its totient is φ = 31064281248.

The previous prime is 31542420269. The next prime is 31542420341. The reversal of 31542420331 is 13302424513.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31542420331 - 2³³ = 22952485739 is a prime.

It is a super-2 number, since 2×31542420331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31542420331.

It is not an unprimeable number, because it can be changed into a prime (31542420341) 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 7 ways as a sum of consecutive naturals, for example, 241065 + ... + 348133.

It is an arithmetic number, because the mean of its divisors is an integer number (4002597810).

Almost surely, 2^31542420331 is an apocalyptic number.

31542420331 is a deficient number, since it is larger than the sum of its proper divisors (478362149).

31542420331 is a wasteful number, since it uses less digits than its factorization.

31542420331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111533.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 31542420331 its reverse (13302424513), we get a palindrome (44844844844).

The spelling of 31542420331 in words is "thirty-one billion, five hundred forty-two million, four hundred twenty thousand, three hundred thirty-one".