42693557 has 2 divisors, whose sum is σ = 42693558. Its totient is φ = 42693556.

The previous prime is 42693533. The next prime is 42693559. The reversal of 42693557 is 75539624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35153041 + 7540516 = 5929^2 + 2746^2 .

It is a cyclic number.

It is not a de Polignac number, because 42693557 - 2¹² = 42689461 is a prime.

Together with 42693559, 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 (42693559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21346778 + 21346779.

It is an arithmetic number, because the mean of its divisors is an integer number (21346779).

Almost surely, 2^42693557 is an apocalyptic number.

It is an amenable number.

42693557 is a deficient number, since it is larger than the sum of its proper divisors (1).

42693557 is an equidigital number, since it uses as much as digits as its factorization.

42693557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 41.

The square root of 42693557 is about 6534.0306855723. The cubic root of 42693557 is about 349.5055794465.

The spelling of 42693557 in words is "forty-two million, six hundred ninety-three thousand, five hundred fifty-seven".