515772049981 has 2 divisors, whose sum is σ = 515772049982. Its totient is φ = 515772049980.

The previous prime is 515772049943. The next prime is 515772049999. The reversal of 515772049981 is 189940277515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371501221081 + 144270828900 = 609509^2 + 379830^2 .

It is a cyclic number.

It is not a de Polignac number, because 515772049981 - 2²³ = 515763661373 is a prime.

It is a super-2 number, since 2×515772049981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515772049381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257886024990 + 257886024991.

It is an arithmetic number, because the mean of its divisors is an integer number (257886024991).

Almost surely, 2^515772049981 is an apocalyptic number.

It is an amenable number.

515772049981 is a deficient number, since it is larger than the sum of its proper divisors (1).

515772049981 is an equidigital number, since it uses as much as digits as its factorization.

515772049981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6350400, while the sum is 58.

The spelling of 515772049981 in words is "five hundred fifteen billion, seven hundred seventy-two million, forty-nine thousand, nine hundred eighty-one".