31438361 has 2 divisors, whose sum is σ = 31438362. Its totient is φ = 31438360.

The previous prime is 31438357. The next prime is 31438373. The reversal of 31438361 is 16383413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30591961 + 846400 = 5531^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 31438361 - 2² = 31438357 is a prime.

It is not a weakly prime, because it can be changed into another prime (31438301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15719180 + 15719181.

It is an arithmetic number, because the mean of its divisors is an integer number (15719181).

Almost surely, 2^31438361 is an apocalyptic number.

It is an amenable number.

31438361 is a deficient number, since it is larger than the sum of its proper divisors (1).

31438361 is an equidigital number, since it uses as much as digits as its factorization.

31438361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 31438361 is about 5606.9921526608. The cubic root of 31438361 is about 315.6118484995.

The spelling of 31438361 in words is "thirty-one million, four hundred thirty-eight thousand, three hundred sixty-one".