261219956 has 12 divisors (see below), whose sum is σ = 461407968. Its totient is φ = 129389112.

The previous prime is 261219949. The next prime is 261219989. The reversal of 261219956 is 659912162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304736 + ... + 305591.

It is an arithmetic number, because the mean of its divisors is an integer number (38450664).

Almost surely, 2^261219956 is an apocalyptic number.

It is an amenable number.

261219956 is a deficient number, since it is larger than the sum of its proper divisors (200188012).

261219956 is a wasteful number, since it uses less digits than its factorization.

261219956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610438 (or 610436 counting only the distinct ones).

The product of its digits is 58320, while the sum is 41.

The square root of 261219956 is about 16162.3004550714. The cubic root of 261219956 is about 639.2471257593.

The spelling of 261219956 in words is "two hundred sixty-one million, two hundred nineteen thousand, nine hundred fifty-six".