2581409617 has 2 divisors, whose sum is σ = 2581409618. Its totient is φ = 2581409616.

The previous prime is 2581409549. The next prime is 2581409689. The reversal of 2581409617 is 7169041852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1426497361 + 1154912256 = 37769^2 + 33984^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2581409617 is a prime.

It is a super-2 number, since 2×2581409617² = 13327351221480173378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2581400617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290704808 + 1290704809.

It is an arithmetic number, because the mean of its divisors is an integer number (1290704809).

Almost surely, 2^2581409617 is an apocalyptic number.

It is an amenable number.

2581409617 is a deficient number, since it is larger than the sum of its proper divisors (1).

2581409617 is an equidigital number, since it uses as much as digits as its factorization.

2581409617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 2581409617 is about 50807.5744057911. The cubic root of 2581409617 is about 1371.7837098165.

The spelling of 2581409617 in words is "two billion, five hundred eighty-one million, four hundred nine thousand, six hundred seventeen".