31222231361 has 2 divisors, whose sum is σ = 31222231362. Its totient is φ = 31222231360.

The previous prime is 31222231357. The next prime is 31222231379. The reversal of 31222231361 is 16313222213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15984797761 + 15237433600 = 126431^2 + 123440^2 .

It is a cyclic number.

It is not a de Polignac number, because 31222231361 - 2² = 31222231357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31222231361.

It is not a weakly prime, because it can be changed into another prime (31222234361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611115680 + 15611115681.

It is an arithmetic number, because the mean of its divisors is an integer number (15611115681).

Almost surely, 2^31222231361 is an apocalyptic number.

It is an amenable number.

31222231361 is a deficient number, since it is larger than the sum of its proper divisors (1).

31222231361 is an equidigital number, since it uses as much as digits as its factorization.

31222231361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

Adding to 31222231361 its reverse (16313222213), we get a palindrome (47535453574).

The spelling of 31222231361 in words is "thirty-one billion, two hundred twenty-two million, two hundred thirty-one thousand, three hundred sixty-one".