31131012203123 has 8 divisors (see below), whose sum is σ = 37125182254848. Its totient is φ = 25523562799944.

The previous prime is 31131012203107. The next prime is 31131012203227. The reversal of 31131012203123 is 32130221013113.

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 31131012203123 - 2⁴ = 31131012203107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31131012209123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96680161961 + ... + 96680162282.

It is an arithmetic number, because the mean of its divisors is an integer number (4640647781856).

Almost surely, 2^{31131012203123} is an apocalyptic number.

31131012203123 is a deficient number, since it is larger than the sum of its proper divisors (5994170051725).

31131012203123 is a wasteful number, since it uses less digits than its factorization.

31131012203123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193360324273.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31131012203123 its reverse (32130221013113), we get a palindrome (63261233216236).

The spelling of 31131012203123 in words is "thirty-one trillion, one hundred thirty-one billion, twelve million, two hundred three thousand, one hundred twenty-three".