31203230213 has 4 divisors (see below), whose sum is σ = 31232420460. Its totient is φ = 31174039968.

The previous prime is 31203230189. The next prime is 31203230221.

31203230213 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25085174689 + 6118055524 = 158383^2 + 78218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31203230213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203230813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14593520 + ... + 14595657.

It is an arithmetic number, because the mean of its divisors is an integer number (7808105115).

Almost surely, 2^31203230213 is an apocalyptic number.

It is an amenable number.

31203230213 is a deficient number, since it is larger than the sum of its proper divisors (29190247).

31203230213 is a wasteful number, since it uses less digits than its factorization.

31203230213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29190246.

The product of its (nonzero) digits is 648, while the sum is 20.

The spelling of 31203230213 in words is "thirty-one billion, two hundred three million, two hundred thirty thousand, two hundred thirteen".