57073781 has 2 divisors, whose sum is σ = 57073782. Its totient is φ = 57073780.

The previous prime is 57073729. The next prime is 57073801. The reversal of 57073781 is 18737075.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46117681 + 10956100 = 6791^2 + 3310^2 .

It is a cyclic number.

It is not a de Polignac number, because 57073781 - 2⁶ = 57073717 is a prime.

It is a super-2 number, since 2×57073781² = 6514832955271922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57072781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28536890 + 28536891.

It is an arithmetic number, because the mean of its divisors is an integer number (28536891).

Almost surely, 2^57073781 is an apocalyptic number.

It is an amenable number.

57073781 is a deficient number, since it is larger than the sum of its proper divisors (1).

57073781 is an equidigital number, since it uses as much as digits as its factorization.

57073781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41160, while the sum is 38.

The square root of 57073781 is about 7554.7191211851. The cubic root of 57073781 is about 385.0160919793.

The spelling of 57073781 in words is "fifty-seven million, seventy-three thousand, seven hundred eighty-one".