261019963 has 2 divisors, whose sum is σ = 261019964. Its totient is φ = 261019962.

The previous prime is 261019961. The next prime is 261019991. The reversal of 261019963 is 369910162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261019963 - 2¹ = 261019961 is a prime.

Together with 261019961, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (261019961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130509981 + 130509982.

It is an arithmetic number, because the mean of its divisors is an integer number (130509982).

Almost surely, 2^261019963 is an apocalyptic number.

261019963 is a deficient number, since it is larger than the sum of its proper divisors (1).

261019963 is an equidigital number, since it uses as much as digits as its factorization.

261019963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 261019963 is about 16156.1122489292. The cubic root of 261019963 is about 639.0839457931.

The spelling of 261019963 in words is "two hundred sixty-one million, nineteen thousand, nine hundred sixty-three".