31442261 has 2 divisors, whose sum is σ = 31442262. Its totient is φ = 31442260.

The previous prime is 31442239. The next prime is 31442263. The reversal of 31442261 is 16224413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29702500 + 1739761 = 5450^2 + 1319^2 .

It is a cyclic number.

It is not a de Polignac number, because 31442261 - 2¹⁰ = 31441237 is a prime.

Together with 31442263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31442263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15721130 + 15721131.

It is an arithmetic number, because the mean of its divisors is an integer number (15721131).

Almost surely, 2^31442261 is an apocalyptic number.

It is an amenable number.

31442261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31442261 is an equidigital number, since it uses as much as digits as its factorization.

31442261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 31442261 is about 5607.3399219238. The cubic root of 31442261 is about 315.6248987485.

Adding to 31442261 its reverse (16224413), we get a palindrome (47666674).

The spelling of 31442261 in words is "thirty-one million, four hundred forty-two thousand, two hundred sixty-one".