31020123220985 has 4 divisors (see below), whose sum is σ = 37224147865188. Its totient is φ = 24816098576784.

The previous prime is 31020123220969. The next prime is 31020123220987. The reversal of 31020123220985 is 58902232102013.

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 3801489967081 + 27218633253904 = 1949741^2 + 5217148^2 .

It is a cyclic number.

It is not a de Polignac number, because 31020123220985 - 2⁴ = 31020123220969 is a prime.

It is a super-2 number, since 2×31020123220985² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31020123220987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3102012322094 + ... + 3102012322103.

It is an arithmetic number, because the mean of its divisors is an integer number (9306036966297).

Almost surely, 2^{31020123220985} is an apocalyptic number.

It is an amenable number.

31020123220985 is a deficient number, since it is larger than the sum of its proper divisors (6204024644203).

31020123220985 is an equidigital number, since it uses as much as digits as its factorization.

31020123220985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6204024644202.

The product of its (nonzero) digits is 51840, while the sum is 38.

Adding to 31020123220985 its reverse (58902232102013), we get a palindrome (89922355322998).

The spelling of 31020123220985 in words is "thirty-one trillion, twenty billion, one hundred twenty-three million, two hundred twenty thousand, nine hundred eighty-five".