261650812 has 12 divisors (see below), whose sum is σ = 464723560. Its totient is φ = 128872656.

The previous prime is 261650803. The next prime is 261650813. The reversal of 261650812 is 218056162.

It is a super-2 number, since 2×261650812² = 136922294840518688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261650813) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 487887 + ... + 488422.

Almost surely, 2^261650812 is an apocalyptic number.

It is an amenable number.

261650812 is a deficient number, since it is larger than the sum of its proper divisors (203072748).

261650812 is a wasteful number, since it uses less digits than its factorization.

261650812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976380 (or 976378 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 261650812 is about 16175.6240065105. The cubic root of 261650812 is about 639.5983906151.

The spelling of 261650812 in words is "two hundred sixty-one million, six hundred fifty thousand, eight hundred twelve".