42801557 has 2 divisors, whose sum is σ = 42801558. Its totient is φ = 42801556.

The previous prime is 42801553. The next prime is 42801601. The reversal of 42801557 is 75510824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34269316 + 8532241 = 5854^2 + 2921^2 .

It is a cyclic number.

It is not a de Polignac number, because 42801557 - 2² = 42801553 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42801553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21400778 + 21400779.

It is an arithmetic number, because the mean of its divisors is an integer number (21400779).

Almost surely, 2^42801557 is an apocalyptic number.

It is an amenable number.

42801557 is a deficient number, since it is larger than the sum of its proper divisors (1).

42801557 is an equidigital number, since it uses as much as digits as its factorization.

42801557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 42801557 is about 6542.2898896334. The cubic root of 42801557 is about 349.8000408848.

The spelling of 42801557 in words is "forty-two million, eight hundred one thousand, five hundred fifty-seven".