2516225581 has 2 divisors, whose sum is σ = 2516225582. Its totient is φ = 2516225580.

The previous prime is 2516225561. The next prime is 2516225617. The reversal of 2516225581 is 1855226152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2443720356 + 72505225 = 49434^2 + 8515^2 .

It is a cyclic number.

It is not a de Polignac number, because 2516225581 - 2⁹ = 2516225069 is a prime.

It is a super-2 number, since 2×2516225581² = 12662782348957575122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2516225581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2516225501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258112790 + 1258112791.

It is an arithmetic number, because the mean of its divisors is an integer number (1258112791).

Almost surely, 2^2516225581 is an apocalyptic number.

It is an amenable number.

2516225581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2516225581 is an equidigital number, since it uses as much as digits as its factorization.

2516225581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48000, while the sum is 37.

The square root of 2516225581 is about 50161.9933914114. The cubic root of 2516225581 is about 1360.1386790894.

The spelling of 2516225581 in words is "two billion, five hundred sixteen million, two hundred twenty-five thousand, five hundred eighty-one".