31323154747 has 4 divisors (see below), whose sum is σ = 31989604896. Its totient is φ = 30656704600.

The previous prime is 31323154727. The next prime is 31323154777. The reversal of 31323154747 is 74745132313.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31323154747 is a prime.

It is a super-2 number, since 2×31323154747² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31323154727) 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 3 ways as a sum of consecutive naturals, for example, 333225004 + ... + 333225097.

It is an arithmetic number, because the mean of its divisors is an integer number (7997401224).

Almost surely, 2^31323154747 is an apocalyptic number.

31323154747 is a deficient number, since it is larger than the sum of its proper divisors (666450149).

31323154747 is an equidigital number, since it uses as much as digits as its factorization.

31323154747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666450148.

The product of its digits is 211680, while the sum is 40.

The spelling of 31323154747 in words is "thirty-one billion, three hundred twenty-three million, one hundred fifty-four thousand, seven hundred forty-seven".