57211813 has 2 divisors, whose sum is σ = 57211814. Its totient is φ = 57211812.

The previous prime is 57211807. The next prime is 57211823. The reversal of 57211813 is 31811275.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53684929 + 3526884 = 7327^2 + 1878^2 .

It is a cyclic number.

It is not a de Polignac number, because 57211813 - 2¹³ = 57203621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57211823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28605906 + 28605907.

It is an arithmetic number, because the mean of its divisors is an integer number (28605907).

Almost surely, 2^57211813 is an apocalyptic number.

It is an amenable number.

57211813 is a deficient number, since it is larger than the sum of its proper divisors (1).

57211813 is an equidigital number, since it uses as much as digits as its factorization.

57211813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 28.

The square root of 57211813 is about 7563.8490862788. The cubic root of 57211813 is about 385.3262271218.

The spelling of 57211813 in words is "fifty-seven million, two hundred eleven thousand, eight hundred thirteen".