42691361 has 2 divisors, whose sum is σ = 42691362. Its totient is φ = 42691360.

The previous prime is 42691249. The next prime is 42691367. The reversal of 42691361 is 16319624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35700625 + 6990736 = 5975^2 + 2644^2 .

It is a cyclic number.

It is not a de Polignac number, because 42691361 - 2¹⁴ = 42674977 is a prime.

It is equal to p_2587055 and since 42691361 and 2587055 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42691367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21345680 + 21345681.

It is an arithmetic number, because the mean of its divisors is an integer number (21345681).

Almost surely, 2^42691361 is an apocalyptic number.

It is an amenable number.

42691361 is a deficient number, since it is larger than the sum of its proper divisors (1).

42691361 is an equidigital number, since it uses as much as digits as its factorization.

42691361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 42691361 is about 6533.8626401234. The cubic root of 42691361 is about 349.4995869154.

It can be divided in two parts, 42691 and 361, that multiplied together give a palindrome (15411451).

The spelling of 42691361 in words is "forty-two million, six hundred ninety-one thousand, three hundred sixty-one".