42697121 has 2 divisors, whose sum is σ = 42697122. Its totient is φ = 42697120.

The previous prime is 42697117. The next prime is 42697159. The reversal of 42697121 is 12179624.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 17305600 = 5039^2 + 4160^2 .

It is a cyclic number.

It is not a de Polignac number, because 42697121 - 2² = 42697117 is a prime.

It is not a weakly prime, because it can be changed into another prime (42697181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21348560 + 21348561.

It is an arithmetic number, because the mean of its divisors is an integer number (21348561).

Almost surely, 2^42697121 is an apocalyptic number.

It is an amenable number.

42697121 is a deficient number, since it is larger than the sum of its proper divisors (1).

42697121 is an equidigital number, since it uses as much as digits as its factorization.

42697121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 42697121 is about 6534.3034058727. The cubic root of 42697121 is about 349.5153045925.

The spelling of 42697121 in words is "forty-two million, six hundred ninety-seven thousand, one hundred twenty-one".