42187361 has 2 divisors, whose sum is σ = 42187362. Its totient is φ = 42187360.

The previous prime is 42187339. The next prime is 42187381. The reversal of 42187361 is 16378124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37210000 + 4977361 = 6100^2 + 2231^2 .

It is a cyclic number.

It is not a de Polignac number, because 42187361 - 2⁶ = 42187297 is a prime.

It is a super-3 number, since 3×42187361³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (42187331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21093680 + 21093681.

It is an arithmetic number, because the mean of its divisors is an integer number (21093681).

Almost surely, 2^42187361 is an apocalyptic number.

It is an amenable number.

42187361 is a deficient number, since it is larger than the sum of its proper divisors (1).

42187361 is an equidigital number, since it uses as much as digits as its factorization.

42187361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 32.

The square root of 42187361 is about 6495.1798281495. The cubic root of 42187361 is about 348.1187801911.

The spelling of 42187361 in words is "forty-two million, one hundred eighty-seven thousand, three hundred sixty-one".