261393463 has 2 divisors, whose sum is σ = 261393464. Its totient is φ = 261393462.

The previous prime is 261393449. The next prime is 261393467. The reversal of 261393463 is 364393162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261393463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261393467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130696731 + 130696732.

It is an arithmetic number, because the mean of its divisors is an integer number (130696732).

Almost surely, 2^261393463 is an apocalyptic number.

261393463 is a deficient number, since it is larger than the sum of its proper divisors (1).

261393463 is an equidigital number, since it uses as much as digits as its factorization.

261393463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 37.

The square root of 261393463 is about 16167.6672095884. The cubic root of 261393463 is about 639.3886275864.

The spelling of 261393463 in words is "two hundred sixty-one million, three hundred ninety-three thousand, four hundred sixty-three".