261951792 has 40 divisors (see below), whose sum is σ = 681890880. Its totient is φ = 86648640.

The previous prime is 261951791. The next prime is 261951797. The reversal of 261951792 is 297159162.

It is a super-2 number, since 2×261951792² = 137237482664022528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261951791) 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 in 7 ways as a sum of consecutive naturals, for example, 14542 + ... + 27117.

It is an arithmetic number, because the mean of its divisors is an integer number (17047272).

Almost surely, 2^261951792 is an apocalyptic number.

It is an amenable number.

261951792 is an abundant number, since it is smaller than the sum of its proper divisors (419939088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261951792 is a wasteful number, since it uses less digits than its factorization.

261951792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41801 (or 41795 counting only the distinct ones).

The product of its digits is 68040, while the sum is 42.

The square root of 261951792 is about 16184.9248376383. The cubic root of 261951792 is about 639.8435424839.

The spelling of 261951792 in words is "two hundred sixty-one million, nine hundred fifty-one thousand, seven hundred ninety-two".