278121061 has 4 divisors (see below), whose sum is σ = 278348224. Its totient is φ = 277893900.

The previous prime is 278121029. The next prime is 278121073. The reversal of 278121061 is 160121872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 278121061 - 2⁵ = 278121029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278121461) 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 3 ways as a sum of consecutive naturals, for example, 111735 + ... + 114196.

It is an arithmetic number, because the mean of its divisors is an integer number (69587056).

Almost surely, 2^278121061 is an apocalyptic number.

It is an amenable number.

278121061 is a deficient number, since it is larger than the sum of its proper divisors (227163).

278121061 is a wasteful number, since it uses less digits than its factorization.

278121061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227162.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 278121061 is about 16676.9619835269. The cubic root of 278121061 is about 652.7466112246.

The spelling of 278121061 in words is "two hundred seventy-eight million, one hundred twenty-one thousand, sixty-one".