57240661 has 2 divisors, whose sum is σ = 57240662. Its totient is φ = 57240660.

The previous prime is 57240647. The next prime is 57240691. The reversal of 57240661 is 16604275.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47748100 + 9492561 = 6910^2 + 3081^2 .

It is a cyclic number.

It is not a de Polignac number, because 57240661 - 2¹¹ = 57238613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57240641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28620330 + 28620331.

It is an arithmetic number, because the mean of its divisors is an integer number (28620331).

Almost surely, 2^57240661 is an apocalyptic number.

It is an amenable number.

57240661 is a deficient number, since it is larger than the sum of its proper divisors (1).

57240661 is an equidigital number, since it uses as much as digits as its factorization.

57240661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 57240661 is about 7565.7558115498. The cubic root of 57240661 is about 385.3909807838.

The spelling of 57240661 in words is "fifty-seven million, two hundred forty thousand, six hundred sixty-one".