31818028261 has 2 divisors, whose sum is σ = 31818028262. Its totient is φ = 31818028260.

The previous prime is 31818028247. The next prime is 31818028271. The reversal of 31818028261 is 16282081813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31815500161 + 2528100 = 178369^2 + 1590^2 .

It is a cyclic number.

It is not a de Polignac number, because 31818028261 - 2²¹ = 31815931109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31818028241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15909014130 + 15909014131.

It is an arithmetic number, because the mean of its divisors is an integer number (15909014131).

Almost surely, 2^31818028261 is an apocalyptic number.

It is an amenable number.

31818028261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31818028261 is an equidigital number, since it uses as much as digits as its factorization.

31818028261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 40.

The spelling of 31818028261 in words is "thirty-one billion, eight hundred eighteen million, twenty-eight thousand, two hundred sixty-one".