278130401 has 2 divisors, whose sum is σ = 278130402. Its totient is φ = 278130400.

The previous prime is 278130397. The next prime is 278130451. The reversal of 278130401 is 104031872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152152225 + 125978176 = 12335^2 + 11224^2 .

It is a cyclic number.

It is not a de Polignac number, because 278130401 - 2² = 278130397 is a prime.

It is not a weakly prime, because it can be changed into another prime (278130451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139065200 + 139065201.

It is an arithmetic number, because the mean of its divisors is an integer number (139065201).

Almost surely, 2^278130401 is an apocalyptic number.

It is an amenable number.

278130401 is a deficient number, since it is larger than the sum of its proper divisors (1).

278130401 is an equidigital number, since it uses as much as digits as its factorization.

278130401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 278130401 is about 16677.2420081979. The cubic root of 278130401 is about 652.7539180967.

The spelling of 278130401 in words is "two hundred seventy-eight million, one hundred thirty thousand, four hundred one".