31213162406 has 4 divisors (see below), whose sum is σ = 46819743612. Its totient is φ = 15606581202.

The previous prime is 31213162403. The next prime is 31213162423. The reversal of 31213162406 is 60426131213.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213162403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7803290600 + ... + 7803290603.

It is an arithmetic number, because the mean of its divisors is an integer number (11704935903).

Almost surely, 2^31213162406 is an apocalyptic number.

31213162406 is a deficient number, since it is larger than the sum of its proper divisors (15606581206).

31213162406 is a wasteful number, since it uses less digits than its factorization.

31213162406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15606581205.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 31213162406 its reverse (60426131213), we get a palindrome (91639293619).

The spelling of 31213162406 in words is "thirty-one billion, two hundred thirteen million, one hundred sixty-two thousand, four hundred six".