42771977 has 2 divisors, whose sum is σ = 42771978. Its totient is φ = 42771976.

The previous prime is 42771947. The next prime is 42771997. The reversal of 42771977 is 77917724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42758521 + 13456 = 6539^2 + 116^2 .

It is a cyclic number.

It is not a de Polignac number, because 42771977 - 2⁶ = 42771913 is a prime.

It is not a weakly prime, because it can be changed into another prime (42771917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21385988 + 21385989.

It is an arithmetic number, because the mean of its divisors is an integer number (21385989).

Almost surely, 2^42771977 is an apocalyptic number.

It is an amenable number.

42771977 is a deficient number, since it is larger than the sum of its proper divisors (1).

42771977 is an equidigital number, since it uses as much as digits as its factorization.

42771977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172872, while the sum is 44.

The square root of 42771977 is about 6540.0288225665. The cubic root of 42771977 is about 349.7194404701.

The spelling of 42771977 in words is "forty-two million, seven hundred seventy-one thousand, nine hundred seventy-seven".