15123020251 has 2 divisors, whose sum is σ = 15123020252. Its totient is φ = 15123020250.

The previous prime is 15123020221. The next prime is 15123020261. The reversal of 15123020251 is 15202032151.

It is a strong prime.

It is an emirp because it is prime and its reverse (15202032151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15123020251 - 2⁹ = 15123019739 is a prime.

It is a super-2 number, since 2×15123020251² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15123020221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7561510125 + 7561510126.

It is an arithmetic number, because the mean of its divisors is an integer number (7561510126).

Almost surely, 2^15123020251 is an apocalyptic number.

15123020251 is a deficient number, since it is larger than the sum of its proper divisors (1).

15123020251 is an equidigital number, since it uses as much as digits as its factorization.

15123020251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The spelling of 15123020251 in words is "fifteen billion, one hundred twenty-three million, twenty thousand, two hundred fifty-one".