261894429 has 12 divisors (see below), whose sum is σ = 387519132. Its totient is φ = 170337600.

The previous prime is 261894427. The next prime is 261894431. The reversal of 261894429 is 924498162.

261894429 is a `hidden beast` number, since 2 + 618 + 9 + 4 + 4 + 29 = 666.

It is an interprime number because it is at equal distance from previous prime (261894427) and next prime (261894431).

It can be written as a sum of positive squares in 2 ways, for example, as 113103225 + 148791204 = 10635^2 + 12198^2 .

It is not a de Polignac number, because 261894429 - 2¹ = 261894427 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261894427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 354502 + ... + 355239.

It is an arithmetic number, because the mean of its divisors is an integer number (32293261).

Almost surely, 2^261894429 is an apocalyptic number.

It is an amenable number.

261894429 is a deficient number, since it is larger than the sum of its proper divisors (125624703).

261894429 is a wasteful number, since it uses less digits than its factorization.

261894429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709788 (or 709785 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 261894429 is about 16183.1526285826. The cubic root of 261894429 is about 639.7968341127.

The spelling of 261894429 in words is "two hundred sixty-one million, eight hundred ninety-four thousand, four hundred twenty-nine".