261598431 has 8 divisors (see below), whose sum is σ = 369315504. Its totient is φ = 164140160.

The previous prime is 261598391. The next prime is 261598451. The reversal of 261598431 is 134895162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261598431 - 2⁷ = 261598303 is a prime.

It is a super-2 number, since 2×261598431² = 136867478203323522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261598431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261598451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2564640 + ... + 2564741.

It is an arithmetic number, because the mean of its divisors is an integer number (46164438).

Almost surely, 2^261598431 is an apocalyptic number.

261598431 is a deficient number, since it is larger than the sum of its proper divisors (107717073).

261598431 is a wasteful number, since it uses less digits than its factorization.

261598431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129401.

The product of its digits is 51840, while the sum is 39.

The square root of 261598431 is about 16174.0047916402. The cubic root of 261598431 is about 639.5557064501. Note that the first 3 decimals are identical.

The spelling of 261598431 in words is "two hundred sixty-one million, five hundred ninety-eight thousand, four hundred thirty-one".