31310222002 has 4 divisors (see below), whose sum is σ = 46965333006. Its totient is φ = 15655111000.

The previous prime is 31310221997. The next prime is 31310222003. The reversal of 31310222002 is 20022201313.

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

It can be written as a sum of positive squares in only one way, i.e., 29408477121 + 1901744881 = 171489^2 + 43609^2 .

It is not an unprimeable number, because it can be changed into a prime (31310222003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7827555499 + ... + 7827555502.

Almost surely, 2^31310222002 is an apocalyptic number.

31310222002 is a deficient number, since it is larger than the sum of its proper divisors (15655111004).

31310222002 is a wasteful number, since it uses less digits than its factorization.

31310222002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15655111003.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31310222002 its reverse (20022201313), we get a palindrome (51332423315).

The spelling of 31310222002 in words is "thirty-one billion, three hundred ten million, two hundred twenty-two thousand, two".