261299693 has 2 divisors, whose sum is σ = 261299694. Its totient is φ = 261299692.

The previous prime is 261299677. The next prime is 261299767. The reversal of 261299693 is 396992162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244547044 + 16752649 = 15638^2 + 4093^2 .

It is a cyclic number.

It is not a de Polignac number, because 261299693 - 2⁴ = 261299677 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261299603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130649846 + 130649847.

It is an arithmetic number, because the mean of its divisors is an integer number (130649847).

Almost surely, 2^261299693 is an apocalyptic number.

It is an amenable number.

261299693 is a deficient number, since it is larger than the sum of its proper divisors (1).

261299693 is an equidigital number, since it uses as much as digits as its factorization.

261299693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 47.

The square root of 261299693 is about 16164.7670258498. The cubic root of 261299693 is about 639.3121622180.

The spelling of 261299693 in words is "two hundred sixty-one million, two hundred ninety-nine thousand, six hundred ninety-three".