2403881561 has 2 divisors, whose sum is σ = 2403881562. Its totient is φ = 2403881560.

The previous prime is 2403881551. The next prime is 2403881567. The reversal of 2403881561 is 1651883042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1598400400 + 805481161 = 39980^2 + 28381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2403881561 is a prime.

It is not a weakly prime, because it can be changed into another prime (2403881567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1201940780 + 1201940781.

It is an arithmetic number, because the mean of its divisors is an integer number (1201940781).

Almost surely, 2^2403881561 is an apocalyptic number.

It is an amenable number.

2403881561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2403881561 is an equidigital number, since it uses as much as digits as its factorization.

2403881561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 2403881561 is about 49029.3948667531. The cubic root of 2403881561 is about 1339.5873016232.

The spelling of 2403881561 in words is "two billion, four hundred three million, eight hundred eighty-one thousand, five hundred sixty-one".