18428949251 has 2 divisors, whose sum is σ = 18428949252. Its totient is φ = 18428949250.

The previous prime is 18428949197. The next prime is 18428949283. The reversal of 18428949251 is 15294982481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18428949251 - 2¹⁴ = 18428932867 is a prime.

It is a super-2 number, since 2×18428949251² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18428949193 and 18428949202.

It is not a weakly prime, because it can be changed into another prime (18428949151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214474625 + 9214474626.

It is an arithmetic number, because the mean of its divisors is an integer number (9214474626).

Almost surely, 2^18428949251 is an apocalyptic number.

18428949251 is a deficient number, since it is larger than the sum of its proper divisors (1).

18428949251 is an equidigital number, since it uses as much as digits as its factorization.

18428949251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 53.

The spelling of 18428949251 in words is "eighteen billion, four hundred twenty-eight million, nine hundred forty-nine thousand, two hundred fifty-one".