31380361 has 2 divisors, whose sum is σ = 31380362. Its totient is φ = 31380360.

The previous prime is 31380353. The next prime is 31380409. The reversal of 31380361 is 16308313.

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., 30869136 + 511225 = 5556^2 + 715^2 .

It is a cyclic number.

It is not a de Polignac number, because 31380361 - 2³ = 31380353 is a prime.

It is not a weakly prime, because it can be changed into another prime (31380331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15690180 + 15690181.

It is an arithmetic number, because the mean of its divisors is an integer number (15690181).

Almost surely, 2^31380361 is an apocalyptic number.

It is an amenable number.

31380361 is a deficient number, since it is larger than the sum of its proper divisors (1).

31380361 is an equidigital number, since it uses as much as digits as its factorization.

31380361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 31380361 is about 5601.8176514414. The cubic root of 31380361 is about 315.4176403694.

Adding to 31380361 its reverse (16308313), we get a palindrome (47688674).

The spelling of 31380361 in words is "thirty-one million, three hundred eighty thousand, three hundred sixty-one".