42981157 has 2 divisors, whose sum is σ = 42981158. Its totient is φ = 42981156.

The previous prime is 42981143. The next prime is 42981187. The reversal of 42981157 is 75118924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 17589636 = 5039^2 + 4194^2 .

It is a cyclic number.

It is not a de Polignac number, because 42981157 - 2¹¹ = 42979109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42981187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21490578 + 21490579.

It is an arithmetic number, because the mean of its divisors is an integer number (21490579).

Almost surely, 2^42981157 is an apocalyptic number.

It is an amenable number.

42981157 is a deficient number, since it is larger than the sum of its proper divisors (1).

42981157 is an equidigital number, since it uses as much as digits as its factorization.

42981157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 42981157 is about 6556.0016015861. The cubic root of 42981157 is about 350.2886245079.

The spelling of 42981157 in words is "forty-two million, nine hundred eighty-one thousand, one hundred fifty-seven".