42503261 has 2 divisors, whose sum is σ = 42503262. Its totient is φ = 42503260.

The previous prime is 42503249. The next prime is 42503267. The reversal of 42503261 is 16230524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42120100 + 383161 = 6490^2 + 619^2 .

It is a cyclic number.

It is not a de Polignac number, because 42503261 - 2¹⁴ = 42486877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42503267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21251630 + 21251631.

It is an arithmetic number, because the mean of its divisors is an integer number (21251631).

Almost surely, 2^42503261 is an apocalyptic number.

It is an amenable number.

42503261 is a deficient number, since it is larger than the sum of its proper divisors (1).

42503261 is an equidigital number, since it uses as much as digits as its factorization.

42503261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 42503261 is about 6519.4525076880. The cubic root of 42503261 is about 348.9855277070.

Adding to 42503261 its reverse (16230524), we get a palindrome (58733785).

The spelling of 42503261 in words is "forty-two million, five hundred three thousand, two hundred sixty-one".