42000061 has 2 divisors, whose sum is σ = 42000062. Its totient is φ = 42000060.

The previous prime is 42000059. The next prime is 42000067. The reversal of 42000061 is 16000024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41847961 + 152100 = 6469^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 42000061 - 2¹ = 42000059 is a prime.

Together with 42000059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42000067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21000030 + 21000031.

It is an arithmetic number, because the mean of its divisors is an integer number (21000031).

Almost surely, 2^42000061 is an apocalyptic number.

It is an amenable number.

42000061 is a deficient number, since it is larger than the sum of its proper divisors (1).

42000061 is an equidigital number, since it uses as much as digits as its factorization.

42000061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 42000061 is about 6480.7454046583. The cubic root of 42000061 is about 347.6028327724.

Adding to 42000061 its reverse (16000024), we get a palindrome (58000085).

The spelling of 42000061 in words is "forty-two million, sixty-one", and thus it is an aban number and an uban number.