31131154243 has 8 divisors (see below), whose sum is σ = 35592473088. Its totient is φ = 26673338184.

The previous prime is 31131154217. The next prime is 31131154259. The reversal of 31131154243 is 34245113113.

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 31131154243 - 2¹³ = 31131146051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31131154543) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 856621 + ... + 892222.

It is an arithmetic number, because the mean of its divisors is an integer number (4449059136).

Almost surely, 2^31131154243 is an apocalyptic number.

31131154243 is a deficient number, since it is larger than the sum of its proper divisors (4461318845).

31131154243 is a wasteful number, since it uses less digits than its factorization.

31131154243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751393.

The product of its digits is 4320, while the sum is 28.

Adding to 31131154243 its reverse (34245113113), we get a palindrome (65376267356).

The spelling of 31131154243 in words is "thirty-one billion, one hundred thirty-one million, one hundred fifty-four thousand, two hundred forty-three".