42180557 has 2 divisors, whose sum is σ = 42180558. Its totient is φ = 42180556.

The previous prime is 42180533. The next prime is 42180563. The reversal of 42180557 is 75508124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40883236 + 1297321 = 6394^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 42180557 - 2²⁴ = 25403341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42182557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21090278 + 21090279.

It is an arithmetic number, because the mean of its divisors is an integer number (21090279).

Almost surely, 2^42180557 is an apocalyptic number.

It is an amenable number.

42180557 is a deficient number, since it is larger than the sum of its proper divisors (1).

42180557 is an equidigital number, since it uses as much as digits as its factorization.

42180557 is an odious number, because the sum of its binary digits is odd.

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

The square root of 42180557 is about 6494.6560340021. The cubic root of 42180557 is about 348.1000642577.

The spelling of 42180557 in words is "forty-two million, one hundred eighty thousand, five hundred fifty-seven".