261013481 has 2 divisors, whose sum is σ = 261013482. Its totient is φ = 261013480.

The previous prime is 261013411. The next prime is 261013523. The reversal of 261013481 is 184310162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143616256 + 117397225 = 11984^2 + 10835^2 .

It is a cyclic number.

It is not a de Polignac number, because 261013481 - 2²⁶ = 193904617 is a prime.

It is a super-2 number, since 2×261013481² = 136256074527474722, 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 261013481.

It is not a weakly prime, because it can be changed into another prime (261013411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130506740 + 130506741.

It is an arithmetic number, because the mean of its divisors is an integer number (130506741).

Almost surely, 2^261013481 is an apocalyptic number.

It is an amenable number.

261013481 is a deficient number, since it is larger than the sum of its proper divisors (1).

261013481 is an equidigital number, since it uses as much as digits as its factorization.

261013481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 261013481 is about 16155.9116424917. The cubic root of 261013481 is about 639.0786555509.

The spelling of 261013481 in words is "two hundred sixty-one million, thirteen thousand, four hundred eighty-one".