42577891 has 2 divisors, whose sum is σ = 42577892. Its totient is φ = 42577890.

The previous prime is 42577823. The next prime is 42577937. The reversal of 42577891 is 19877524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42577891 - 2¹⁷ = 42446819 is a prime.

It is a super-4 number, since 4×42577891⁴ (a number of 32 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (45577891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21288945 + 21288946.

It is an arithmetic number, because the mean of its divisors is an integer number (21288946).

Almost surely, 2^42577891 is an apocalyptic number.

42577891 is a deficient number, since it is larger than the sum of its proper divisors (1).

42577891 is an equidigital number, since it uses as much as digits as its factorization.

42577891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 42577891 is about 6525.1736375364. The cubic root of 42577891 is about 349.1896654638.

The spelling of 42577891 in words is "forty-two million, five hundred seventy-seven thousand, eight hundred ninety-one".