31109801 has 2 divisors, whose sum is σ = 31109802. Its totient is φ = 31109800.

The previous prime is 31109797. The next prime is 31109803. The reversal of 31109801 is 10890113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23814400 + 7295401 = 4880^2 + 2701^2 .

It is a cyclic number.

It is not a de Polignac number, because 31109801 - 2² = 31109797 is a prime.

It is a Sophie Germain prime.

Together with 31109803, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is equal to p_1922270 and since 31109801 and 1922270 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31109803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15554900 + 15554901.

It is an arithmetic number, because the mean of its divisors is an integer number (15554901).

Almost surely, 2^31109801 is an apocalyptic number.

It is an amenable number.

31109801 is a deficient number, since it is larger than the sum of its proper divisors (1).

31109801 is an equidigital number, since it uses as much as digits as its factorization.

31109801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 31109801 is about 5577.6160678197. The cubic root of 31109801 is about 314.5085171711.

Adding to 31109801 its reverse (10890113), we get a palindrome (41999914).

The spelling of 31109801 in words is "thirty-one million, one hundred nine thousand, eight hundred one".