57213157 has 2 divisors, whose sum is σ = 57213158. Its totient is φ = 57213156.

The previous prime is 57213139. The next prime is 57213173. The reversal of 57213157 is 75131275.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54552996 + 2660161 = 7386^2 + 1631^2 .

It is a cyclic number.

It is not a de Polignac number, because 57213157 - 2¹⁹ = 56688869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57213757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28606578 + 28606579.

It is an arithmetic number, because the mean of its divisors is an integer number (28606579).

Almost surely, 2^57213157 is an apocalyptic number.

It is an amenable number.

57213157 is a deficient number, since it is larger than the sum of its proper divisors (1).

57213157 is an equidigital number, since it uses as much as digits as its factorization.

57213157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7350, while the sum is 31.

The square root of 57213157 is about 7563.9379294122. The cubic root of 57213157 is about 385.3292444148.

It can be divided in two parts, 57213 and 157, that multiplied together give a triangular number (8982441 = T₄₂₃₈).

The spelling of 57213157 in words is "fifty-seven million, two hundred thirteen thousand, one hundred fifty-seven".