261089402 has 16 divisors (see below), whose sum is σ = 448918080. Its totient is φ = 111561408.

The previous prime is 261089401. The next prime is 261089443. The reversal of 261089402 is 204980162.

It is not an unprimeable number, because it can be changed into a prime (261089401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22952 + ... + 32387.

It is an arithmetic number, because the mean of its divisors is an integer number (28057380).

Almost surely, 2^261089402 is an apocalyptic number.

261089402 is a deficient number, since it is larger than the sum of its proper divisors (187828678).

261089402 is a wasteful number, since it uses less digits than its factorization.

261089402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55685.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 261089402 is about 16158.2611069385. The cubic root of 261089402 is about 639.1406124875.

The spelling of 261089402 in words is "two hundred sixty-one million, eighty-nine thousand, four hundred two".