4278509261 has 4 divisors (see below), whose sum is σ = 4607625372. Its totient is φ = 3949393152.

The previous prime is 4278509239. The next prime is 4278509267. The reversal of 4278509261 is 1629058724.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2863320100 + 1415189161 = 53510^2 + 37619^2 .

It is a cyclic number.

It is not a de Polignac number, because 4278509261 - 2¹⁰ = 4278508237 is a prime.

It is a super-2 number, since 2×4278509261² = 36611282992925532242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4278509267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164558036 + ... + 164558061.

It is an arithmetic number, because the mean of its divisors is an integer number (1151906343).

Almost surely, 2^4278509261 is an apocalyptic number.

It is an amenable number.

4278509261 is a deficient number, since it is larger than the sum of its proper divisors (329116111).

4278509261 is a wasteful number, since it uses less digits than its factorization.

4278509261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329116110.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 4278509261 is about 65410.3146376777. The cubic root of 4278509261 is about 1623.4197511526.

The spelling of 4278509261 in words is "four billion, two hundred seventy-eight million, five hundred nine thousand, two hundred sixty-one".