278097997 has 4 divisors (see below), whose sum is σ = 278139420. Its totient is φ = 278056576.

The previous prime is 278097973. The next prime is 278098021. The reversal of 278097997 is 799790872.

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

It is an interprime number because it is at equal distance from previous prime (278097973) and next prime (278098021).

It can be written as a sum of positive squares in 2 ways, for example, as 29278921 + 248819076 = 5411^2 + 15774^2 .

It is a cyclic number.

It is not a de Polignac number, because 278097997 - 2¹¹ = 278095949 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 (278097947) 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, 8068 + ... + 24925.

It is an arithmetic number, because the mean of its divisors is an integer number (69534855).

Almost surely, 2^278097997 is an apocalyptic number.

It is an amenable number.

278097997 is a deficient number, since it is larger than the sum of its proper divisors (41423).

278097997 is an equidigital number, since it uses as much as digits as its factorization.

278097997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41422.

The product of its (nonzero) digits is 4000752, while the sum is 58.

The square root of 278097997 is about 16676.2704763385. The cubic root of 278097997 is about 652.7285670870.

The spelling of 278097997 in words is "two hundred seventy-eight million, ninety-seven thousand, nine hundred ninety-seven".