2545558381 has 2 divisors, whose sum is σ = 2545558382. Its totient is φ = 2545558380.

The previous prime is 2545558369. The next prime is 2545558387. The reversal of 2545558381 is 1838555452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2140542756 + 405015625 = 46266^2 + 20125^2 .

It is a cyclic number.

It is not a de Polignac number, because 2545558381 - 2²³ = 2537169773 is a prime.

It is a super-2 number, since 2×2545558381² = 12959734942158682322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2545558387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272779190 + 1272779191.

It is an arithmetic number, because the mean of its divisors is an integer number (1272779191).

Almost surely, 2^2545558381 is an apocalyptic number.

It is an amenable number.

2545558381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2545558381 is an equidigital number, since it uses as much as digits as its factorization.

2545558381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960000, while the sum is 46.

The square root of 2545558381 is about 50453.5269431187. The cubic root of 2545558381 is about 1365.4035277769.

The spelling of 2545558381 in words is "two billion, five hundred forty-five million, five hundred fifty-eight thousand, three hundred eighty-one".