261490252 has 6 divisors (see below), whose sum is σ = 457607948. Its totient is φ = 130745124.

The previous prime is 261490247. The next prime is 261490253. The reversal of 261490252 is 252094162.

It is not an unprimeable number, because it can be changed into a prime (261490253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32686278 + ... + 32686285.

Almost surely, 2^261490252 is an apocalyptic number.

It is an amenable number.

261490252 is a deficient number, since it is larger than the sum of its proper divisors (196117696).

261490252 is a wasteful number, since it uses less digits than its factorization.

261490252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65372567 (or 65372565 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 261490252 is about 16170.6602215247. The cubic root of 261490252 is about 639.4675356411.

The spelling of 261490252 in words is "two hundred sixty-one million, four hundred ninety thousand, two hundred fifty-two".