278154013 has 2 divisors, whose sum is σ = 278154014. Its totient is φ = 278154012.

The previous prime is 278153989. The next prime is 278154029. The reversal of 278154013 is 310451872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278122329 + 31684 = 16677^2 + 178^2 .

It is a cyclic number.

It is not a de Polignac number, because 278154013 - 2¹³ = 278145821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278154913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139077006 + 139077007.

It is an arithmetic number, because the mean of its divisors is an integer number (139077007).

Almost surely, 2^278154013 is an apocalyptic number.

It is an amenable number.

278154013 is a deficient number, since it is larger than the sum of its proper divisors (1).

278154013 is an equidigital number, since it uses as much as digits as its factorization.

278154013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 278154013 is about 16677.9499039900. The cubic root of 278154013 is about 652.7723895155.

The spelling of 278154013 in words is "two hundred seventy-eight million, one hundred fifty-four thousand, thirteen".