261941939 has 8 divisors (see below), whose sum is σ = 306324480. Its totient is φ = 219299976.

The previous prime is 261941929. The next prime is 261941987. The reversal of 261941939 is 939149162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261941939 - 2⁸ = 261941683 is a prime.

It is a super-2 number, since 2×261941939² = 137227158814159442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261941939.

It is not an unprimeable number, because it can be changed into a prime (261941929) 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, 434819 + ... + 435420.

It is an arithmetic number, because the mean of its divisors is an integer number (38290560).

Almost surely, 2^261941939 is an apocalyptic number.

261941939 is a deficient number, since it is larger than the sum of its proper divisors (44382541).

261941939 is an equidigital number, since it uses as much as digits as its factorization.

261941939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870289.

The product of its digits is 104976, while the sum is 44.

The square root of 261941939 is about 16184.6204465845. The cubic root of 261941939 is about 639.8355200695.

The spelling of 261941939 in words is "two hundred sixty-one million, nine hundred forty-one thousand, nine hundred thirty-nine".