261497963 has 2 divisors, whose sum is σ = 261497964. Its totient is φ = 261497962.

The previous prime is 261497941. The next prime is 261497993. The reversal of 261497963 is 369794162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261497963 - 2¹² = 261493867 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261497903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130748981 + 130748982.

It is an arithmetic number, because the mean of its divisors is an integer number (130748982).

Almost surely, 2^261497963 is an apocalyptic number.

261497963 is a deficient number, since it is larger than the sum of its proper divisors (1).

261497963 is an equidigital number, since it uses as much as digits as its factorization.

261497963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 47.

The square root of 261497963 is about 16170.8986454062. The cubic root of 261497963 is about 639.4738212619.

The spelling of 261497963 in words is "two hundred sixty-one million, four hundred ninety-seven thousand, nine hundred sixty-three".