31105201 has 2 divisors, whose sum is σ = 31105202. Its totient is φ = 31105200.

The previous prime is 31105157. The next prime is 31105237. The reversal of 31105201 is 10250113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30813601 + 291600 = 5551^2 + 540^2 .

It is an emirp because it is prime and its reverse (10250113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31105201 - 2¹³ = 31097009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31105901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15552600 + 15552601.

It is an arithmetic number, because the mean of its divisors is an integer number (15552601).

Almost surely, 2^31105201 is an apocalyptic number.

It is an amenable number.

31105201 is a deficient number, since it is larger than the sum of its proper divisors (1).

31105201 is an equidigital number, since it uses as much as digits as its factorization.

31105201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 31105201 is about 5577.2036900224. The cubic root of 31105201 is about 314.4930149773.

Adding to 31105201 its reverse (10250113), we get a palindrome (41355314).

The spelling of 31105201 in words is "thirty-one million, one hundred five thousand, two hundred one".