1378253251 has 2 divisors, whose sum is σ = 1378253252. Its totient is φ = 1378253250.

The previous prime is 1378253237. The next prime is 1378253267. The reversal of 1378253251 is 1523528731.

It is a weak prime.

It is an emirp because it is prime and its reverse (1523528731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1378253251 - 2⁹ = 1378252739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1378253251.

It is not a weakly prime, because it can be changed into another prime (1378253351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689126625 + 689126626.

It is an arithmetic number, because the mean of its divisors is an integer number (689126626).

Almost surely, 2^1378253251 is an apocalyptic number.

1378253251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378253251 is an equidigital number, since it uses as much as digits as its factorization.

1378253251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 1378253251 is about 37124.8333464273. The cubic root of 1378253251 is about 1112.8663442915.

The spelling of 1378253251 in words is "one billion, three hundred seventy-eight million, two hundred fifty-three thousand, two hundred fifty-one".