557073721 has 2 divisors, whose sum is σ = 557073722. Its totient is φ = 557073720.

The previous prime is 557073709. The next prime is 557073733. The reversal of 557073721 is 127370755.

It is a balanced prime because it is at equal distance from previous prime (557073709) and next prime (557073733).

It can be written as a sum of positive squares in only one way, i.e., 441210025 + 115863696 = 21005^2 + 10764^2 .

It is a cyclic number.

It is not a de Polignac number, because 557073721 - 2¹¹ = 557071673 is a prime.

It is a super-2 number, since 2×557073721² = 620662261257571682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (557073761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278536860 + 278536861.

It is an arithmetic number, because the mean of its divisors is an integer number (278536861).

Almost surely, 2^557073721 is an apocalyptic number.

It is an amenable number.

557073721 is a deficient number, since it is larger than the sum of its proper divisors (1).

557073721 is an equidigital number, since it uses as much as digits as its factorization.

557073721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51450, while the sum is 37.

The square root of 557073721 is about 23602.4092202470. The cubic root of 557073721 is about 822.8188339643.

The spelling of 557073721 in words is "five hundred fifty-seven million, seventy-three thousand, seven hundred twenty-one".