7928049251 has 2 divisors, whose sum is σ = 7928049252. Its totient is φ = 7928049250.

The previous prime is 7928049247. The next prime is 7928049293. The reversal of 7928049251 is 1529408297.

It is a weak prime.

It is an emirp because it is prime and its reverse (1529408297) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7928049251 - 2² = 7928049247 is a prime.

It is a super-2 number, since 2×7928049251² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7928049196 and 7928049205.

It is not a weakly prime, because it can be changed into another prime (7928049211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3964024625 + 3964024626.

It is an arithmetic number, because the mean of its divisors is an integer number (3964024626).

Almost surely, 2^7928049251 is an apocalyptic number.

7928049251 is a deficient number, since it is larger than the sum of its proper divisors (1).

7928049251 is an equidigital number, since it uses as much as digits as its factorization.

7928049251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 7928049251 is about 89039.5937266113. The cubic root of 7928049251 is about 1993.9860385095.

The spelling of 7928049251 in words is "seven billion, nine hundred twenty-eight million, forty-nine thousand, two hundred fifty-one".