31223120986 has 4 divisors (see below), whose sum is σ = 46834681482. Its totient is φ = 15611560492.

The previous prime is 31223120923. The next prime is 31223120987. The reversal of 31223120986 is 68902132213.

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., 21252099961 + 9971021025 = 145781^2 + 99855^2 .

It is a super-2 number, since 2×31223120986² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31223120987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7805780245 + ... + 7805780248.

Almost surely, 2^31223120986 is an apocalyptic number.

31223120986 is a deficient number, since it is larger than the sum of its proper divisors (15611560496).

31223120986 is a wasteful number, since it uses less digits than its factorization.

31223120986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15611560495.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 31223120986 in words is "thirty-one billion, two hundred twenty-three million, one hundred twenty thousand, nine hundred eighty-six".