42715661 has 2 divisors, whose sum is σ = 42715662. Its totient is φ = 42715660.

The previous prime is 42715633. The next prime is 42715663. The reversal of 42715661 is 16651724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23522500 + 19193161 = 4850^2 + 4381^2 .

It is a cyclic number.

It is not a de Polignac number, because 42715661 - 2⁶ = 42715597 is a prime.

Together with 42715663, 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 (42715663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21357830 + 21357831.

It is an arithmetic number, because the mean of its divisors is an integer number (21357831).

Almost surely, 2^42715661 is an apocalyptic number.

It is an amenable number.

42715661 is a deficient number, since it is larger than the sum of its proper divisors (1).

42715661 is an equidigital number, since it uses as much as digits as its factorization.

42715661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 32.

The square root of 42715661 is about 6535.7219188090. The cubic root of 42715661 is about 349.5658862703.

The spelling of 42715661 in words is "forty-two million, seven hundred fifteen thousand, six hundred sixty-one".