249078121 has 2 divisors, whose sum is σ = 249078122. Its totient is φ = 249078120.

The previous prime is 249078083. The next prime is 249078127. The reversal of 249078121 is 121870942.

249078121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241460521 + 7617600 = 15539^2 + 2760^2 .

It is a cyclic number.

It is not a de Polignac number, because 249078121 - 2¹³ = 249069929 is a prime.

It is not a weakly prime, because it can be changed into another prime (249078127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124539060 + 124539061.

It is an arithmetic number, because the mean of its divisors is an integer number (124539061).

Almost surely, 2^249078121 is an apocalyptic number.

It is an amenable number.

249078121 is a deficient number, since it is larger than the sum of its proper divisors (1).

249078121 is an equidigital number, since it uses as much as digits as its factorization.

249078121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 249078121 is about 15782.2090025446. The cubic root of 249078121 is about 629.1852413699.

The spelling of 249078121 in words is "two hundred forty-nine million, seventy-eight thousand, one hundred twenty-one".