42961613 has 2 divisors, whose sum is σ = 42961614. Its totient is φ = 42961612.

The previous prime is 42961579. The next prime is 42961627. The reversal of 42961613 is 31616924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24186724 + 18774889 = 4918^2 + 4333^2 .

42961613 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 42961613 - 2¹⁸ = 42699469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42961613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42961643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21480806 + 21480807.

It is an arithmetic number, because the mean of its divisors is an integer number (21480807).

Almost surely, 2^42961613 is an apocalyptic number.

It is an amenable number.

42961613 is a deficient number, since it is larger than the sum of its proper divisors (1).

42961613 is an equidigital number, since it uses as much as digits as its factorization.

42961613 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 42961613 is about 6554.5108894562. The cubic root of 42961613 is about 350.2355231081.

The spelling of 42961613 in words is "forty-two million, nine hundred sixty-one thousand, six hundred thirteen".