261310998 has 32 divisors (see below), whose sum is σ = 565199712. Its totient is φ = 80064000.

The previous prime is 261310993. The next prime is 261311077. The reversal of 261310998 is 899013162.

261310998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261310993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11848 + ... + 25748.

It is an arithmetic number, because the mean of its divisors is an integer number (17662491).

Almost surely, 2^261310998 is an apocalyptic number.

261310998 is an abundant number, since it is smaller than the sum of its proper divisors (303888714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261310998 is a wasteful number, since it uses less digits than its factorization.

261310998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14160.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 261310998 is about 16165.1167023316. The cubic root of 261310998 is about 639.3213819249.

The spelling of 261310998 in words is "two hundred sixty-one million, three hundred ten thousand, nine hundred ninety-eight".