261798469 has 2 divisors, whose sum is σ = 261798470. Its totient is φ = 261798468.

The previous prime is 261798437. The next prime is 261798497. The reversal of 261798469 is 964897162.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191490244 + 70308225 = 13838^2 + 8385^2 .

It is a cyclic number.

It is not a de Polignac number, because 261798469 - 2⁵ = 261798437 is a prime.

It is a super-2 number, since 2×261798469² = 137076876741487922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261798409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130899234 + 130899235.

It is an arithmetic number, because the mean of its divisors is an integer number (130899235).

Almost surely, 2^261798469 is an apocalyptic number.

It is an amenable number.

261798469 is a deficient number, since it is larger than the sum of its proper divisors (1).

261798469 is an equidigital number, since it uses as much as digits as its factorization.

261798469 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 261798469 is about 16180.1875452666. The cubic root of 261798469 is about 639.7186825150.

The spelling of 261798469 in words is "two hundred sixty-one million, seven hundred ninety-eight thousand, four hundred sixty-nine".