2461581781 has 2 divisors, whose sum is σ = 2461581782. Its totient is φ = 2461581780.

The previous prime is 2461581761. The next prime is 2461581791. The reversal of 2461581781 is 1871851642.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1831069681 + 630512100 = 42791^2 + 25110^2 .

It is a cyclic number.

It is not a de Polignac number, because 2461581781 - 2¹¹ = 2461579733 is a prime.

It is a super-2 number, since 2×2461581781² = 12118769729102263922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2461581761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1230790890 + 1230790891.

It is an arithmetic number, because the mean of its divisors is an integer number (1230790891).

Almost surely, 2^2461581781 is an apocalyptic number.

It is an amenable number.

2461581781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2461581781 is an equidigital number, since it uses as much as digits as its factorization.

2461581781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 43.

The square root of 2461581781 is about 49614.3303995932. The cubic root of 2461581781 is about 1350.2206828990.

The spelling of 2461581781 in words is "two billion, four hundred sixty-one million, five hundred eighty-one thousand, seven hundred eighty-one".