57661111 has 2 divisors, whose sum is σ = 57661112. Its totient is φ = 57661110.

The previous prime is 57661103. The next prime is 57661117. The reversal of 57661111 is 11116675.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57661111 - 2³ = 57661103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57661111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57661117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28830555 + 28830556.

It is an arithmetic number, because the mean of its divisors is an integer number (28830556).

Almost surely, 2^57661111 is an apocalyptic number.

57661111 is a deficient number, since it is larger than the sum of its proper divisors (1).

57661111 is an equidigital number, since it uses as much as digits as its factorization.

57661111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 28.

The square root of 57661111 is about 7593.4913577353. The cubic root of 57661111 is about 386.3322843235.

Adding to 57661111 its reverse (11116675), we get a palindrome (68777786).

The spelling of 57661111 in words is "fifty-seven million, six hundred sixty-one thousand, one hundred eleven".