261308798 has 4 divisors (see below), whose sum is σ = 391963200. Its totient is φ = 130654398.

The previous prime is 261308791. The next prime is 261308809. The reversal of 261308798 is 897803162.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261308791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65327198 + ... + 65327201.

It is an arithmetic number, because the mean of its divisors is an integer number (97990800).

Almost surely, 2^261308798 is an apocalyptic number.

261308798 is a deficient number, since it is larger than the sum of its proper divisors (130654402).

261308798 is a wasteful number, since it uses less digits than its factorization.

261308798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130654401.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 261308798 is about 16165.0486544272. The cubic root of 261308798 is about 639.3195877525.

The spelling of 261308798 in words is "two hundred sixty-one million, three hundred eight thousand, seven hundred ninety-eight".