31009841 has 2 divisors, whose sum is σ = 31009842. Its totient is φ = 31009840.

The previous prime is 31009793. The next prime is 31009883. The reversal of 31009841 is 14890013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21529600 + 9480241 = 4640^2 + 3079^2 .

It is a cyclic number.

It is not a de Polignac number, because 31009841 - 2¹⁸ = 30747697 is a prime.

It is a super-2 number, since 2×31009841² = 1923220477690562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31009841.

It is not a weakly prime, because it can be changed into another prime (31000841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15504920 + 15504921.

It is an arithmetic number, because the mean of its divisors is an integer number (15504921).

Almost surely, 2^31009841 is an apocalyptic number.

It is an amenable number.

31009841 is a deficient number, since it is larger than the sum of its proper divisors (1).

31009841 is an equidigital number, since it uses as much as digits as its factorization.

31009841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 31009841 is about 5568.6480405930. The cubic root of 31009841 is about 314.1713029341.

Adding to 31009841 its reverse (14890013), we get a palindrome (45899854).

The spelling of 31009841 in words is "thirty-one million, nine thousand, eight hundred forty-one".