42123577 has 2 divisors, whose sum is σ = 42123578. Its totient is φ = 42123576.

The previous prime is 42123559. The next prime is 42123583. The reversal of 42123577 is 77532124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34621456 + 7502121 = 5884^2 + 2739^2 .

It is a cyclic number.

It is not a de Polignac number, because 42123577 - 2⁷ = 42123449 is a prime.

It is not a weakly prime, because it can be changed into another prime (42123677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21061788 + 21061789.

It is an arithmetic number, because the mean of its divisors is an integer number (21061789).

Almost surely, 2^42123577 is an apocalyptic number.

It is an amenable number.

42123577 is a deficient number, since it is larger than the sum of its proper divisors (1).

42123577 is an equidigital number, since it uses as much as digits as its factorization.

42123577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 31.

The square root of 42123577 is about 6490.2678681238. The cubic root of 42123577 is about 347.9432488819.

The spelling of 42123577 in words is "forty-two million, one hundred twenty-three thousand, five hundred seventy-seven".