261231802 has 16 divisors (see below), whose sum is σ = 422319240. Its totient is φ = 120474432.

The previous prime is 261231757. The next prime is 261231811. The reversal of 261231802 is 208132162.

261231802 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 196252081 + 64979721 = 14009^2 + 8061^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38824 + ... + 45052.

Almost surely, 2^261231802 is an apocalyptic number.

261231802 is a deficient number, since it is larger than the sum of its proper divisors (161087438).

261231802 is a wasteful number, since it uses less digits than its factorization.

261231802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7857.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 261231802 is about 16162.6669210251. Note that the first 3 decimals coincide. The cubic root of 261231802 is about 639.2567886339.

Adding to 261231802 its reverse (208132162), we get a palindrome (469363964).

The spelling of 261231802 in words is "two hundred sixty-one million, two hundred thirty-one thousand, eight hundred two".