261003481 has 2 divisors, whose sum is σ = 261003482. Its totient is φ = 261003480.

The previous prime is 261003409. The next prime is 261003487. The reversal of 261003481 is 184300162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245987856 + 15015625 = 15684^2 + 3875^2 .

It is a cyclic number.

It is not a de Polignac number, because 261003481 - 2⁹ = 261002969 is a prime.

It is a super-2 number, since 2×261003481² = 136245634188234722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261003487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130501740 + 130501741.

It is an arithmetic number, because the mean of its divisors is an integer number (130501741).

Almost surely, 2^261003481 is an apocalyptic number.

It is an amenable number.

261003481 is a deficient number, since it is larger than the sum of its proper divisors (1).

261003481 is an equidigital number, since it uses as much as digits as its factorization.

261003481 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 25.

The square root of 261003481 is about 16155.6021552897. The cubic root of 261003481 is about 639.0704939442.

The spelling of 261003481 in words is "two hundred sixty-one million, three thousand, four hundred eighty-one".