261211250 has 40 divisors (see below), whose sum is σ = 494701020. Its totient is φ = 103400000.

The previous prime is 261211217. The next prime is 261211271. The reversal of 261211250 is 52112162.

261211250 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 10 ways, for example, as 8369449 + 252841801 = 2893^2 + 15901^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 125216 + ... + 127284.

Almost surely, 2^261211250 is an apocalyptic number.

261211250 is a deficient number, since it is larger than the sum of its proper divisors (233489770).

261211250 is a wasteful number, since it uses less digits than its factorization.

261211250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192 (or 2177 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 261211250 is about 16162.0311223559. The cubic root of 261211250 is about 639.2400240210.

It can be divided in two parts, 2612112 and 50, that added together give a palindrome (2612162).

The spelling of 261211250 in words is "two hundred sixty-one million, two hundred eleven thousand, two hundred fifty".