261219950 has 48 divisors (see below), whose sum is σ = 505872384. Its totient is φ = 100245600.

The previous prime is 261219949. The next prime is 261219989. The reversal of 261219950 is 59912162.

261219950 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 261219950.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196187 + ... + 197513.

It is an arithmetic number, because the mean of its divisors is an integer number (10539008).

Almost surely, 2^261219950 is an apocalyptic number.

261219950 is a deficient number, since it is larger than the sum of its proper divisors (244652434).

261219950 is a wasteful number, since it uses less digits than its factorization.

261219950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497 (or 1492 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 261219950 is about 16162.3002694542. The cubic root of 261219950 is about 639.2471208650.

The spelling of 261219950 in words is "two hundred sixty-one million, two hundred nineteen thousand, nine hundred fifty".