278497897441 has 3 divisors (see below), whose sum is σ = 278498425171. Its totient is φ = 278497369712.

The previous prime is 278497897399. The next prime is 278497897567. The reversal of 278497897441 is 144798794872.

It is a happy number.

The square root of 278497897441 is 527729.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 768897441 + 277729000000 = 27729^2 + 527000^2 .

It is not a de Polignac number, because 278497897441 - 2¹⁷ = 278497766369 is a prime.

It is a super-2 number, since 2×278497897441² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278497897841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 263865 + ... + 791593.

Almost surely, 2^278497897441 is an apocalyptic number.

278497897441 is the 527729-th square number.

278497897441 is the 263865-th centered octagonal number.

It is an amenable number.

278497897441 is a deficient number, since it is larger than the sum of its proper divisors (527730).

278497897441 is an frugal number, since it uses more digits than its factorization.

278497897441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055458 (or 527729 counting only the distinct ones).

The product of its digits is 227598336, while the sum is 70.

The spelling of 278497897441 in words is "two hundred seventy-eight billion, four hundred ninety-seven million, eight hundred ninety-seven thousand, four hundred forty-one".