261496987 has 2 divisors, whose sum is σ = 261496988. Its totient is φ = 261496986.

The previous prime is 261496931. The next prime is 261497011. The reversal of 261496987 is 789694162.

It is a happy number.

261496987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261496987 - 2¹¹ = 261494939 is a prime.

It is not a weakly prime, because it can be changed into another prime (261496087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130748493 + 130748494.

It is an arithmetic number, because the mean of its divisors is an integer number (130748494).

Almost surely, 2^261496987 is an apocalyptic number.

261496987 is a deficient number, since it is larger than the sum of its proper divisors (1).

261496987 is an equidigital number, since it uses as much as digits as its factorization.

261496987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 261496987 is about 16170.8684677107. The cubic root of 261496987 is about 639.4730256825.

The spelling of 261496987 in words is "two hundred sixty-one million, four hundred ninety-six thousand, nine hundred eighty-seven".