261430489 has 4 divisors (see below), whose sum is σ = 272797056. Its totient is φ = 250063924.

The previous prime is 261430487. The next prime is 261430501. The reversal of 261430489 is 984034162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261430489 - 2¹ = 261430487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261430487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5683249 + ... + 5683294.

It is an arithmetic number, because the mean of its divisors is an integer number (68199264).

Almost surely, 2^261430489 is an apocalyptic number.

It is an amenable number.

261430489 is a deficient number, since it is larger than the sum of its proper divisors (11366567).

261430489 is a wasteful number, since it uses less digits than its factorization.

261430489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11366566.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 261430489 is about 16168.8122321957. The cubic root of 261430489 is about 639.4188156476.

The spelling of 261430489 in words is "two hundred sixty-one million, four hundred thirty thousand, four hundred eighty-nine".