42242261 has 2 divisors, whose sum is σ = 42242262. Its totient is φ = 42242260.

The previous prime is 42242251. The next prime is 42242267. The reversal of 42242261 is 16224224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42172036 + 70225 = 6494^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 42242261 - 2¹⁸ = 41980117 is a prime.

It is a super-2 number, since 2×42242261² = 3568817228784242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42242267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21121130 + 21121131.

It is an arithmetic number, because the mean of its divisors is an integer number (21121131).

Almost surely, 2^42242261 is an apocalyptic number.

It is an amenable number.

42242261 is a deficient number, since it is larger than the sum of its proper divisors (1).

42242261 is an equidigital number, since it uses as much as digits as its factorization.

42242261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 23.

The square root of 42242261 is about 6499.4046650443. The cubic root of 42242261 is about 348.2697214233.

Adding to 42242261 its reverse (16224224), we get a palindrome (58466485).

The spelling of 42242261 in words is "forty-two million, two hundred forty-two thousand, two hundred sixty-one".