278961451 has 4 divisors (see below), whose sum is σ = 279023400. Its totient is φ = 278899504.

The previous prime is 278961443. The next prime is 278961493. The reversal of 278961451 is 154169872.

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

It is a cyclic number.

It is not a de Polignac number, because 278961451 - 2³ = 278961443 is a prime.

It is a super-2 number, since 2×278961451² = 155638982288050802, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 278961398 and 278961407.

It is not an unprimeable number, because it can be changed into a prime (278961751) 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, 23641 + ... + 33418.

It is an arithmetic number, because the mean of its divisors is an integer number (69755850).

Almost surely, 2^278961451 is an apocalyptic number.

278961451 is a deficient number, since it is larger than the sum of its proper divisors (61949).

278961451 is an equidigital number, since it uses as much as digits as its factorization.

278961451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61948.

The product of its digits is 120960, while the sum is 43.

The square root of 278961451 is about 16702.1391144967. The cubic root of 278961451 is about 653.4034116890.

The spelling of 278961451 in words is "two hundred seventy-eight million, nine hundred sixty-one thousand, four hundred fifty-one".