428667251 has 2 divisors, whose sum is σ = 428667252. Its totient is φ = 428667250.

The previous prime is 428667229. The next prime is 428667269. The reversal of 428667251 is 152766824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428667251 - 2¹⁴ = 428650867 is a prime.

It is a super-2 number, since 2×428667251² = 367511224159794002, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 428667199 and 428667208.

It is not a weakly prime, because it can be changed into another prime (428667451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214333625 + 214333626.

It is an arithmetic number, because the mean of its divisors is an integer number (214333626).

Almost surely, 2^428667251 is an apocalyptic number.

428667251 is a deficient number, since it is larger than the sum of its proper divisors (1).

428667251 is an equidigital number, since it uses as much as digits as its factorization.

428667251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 41.

The square root of 428667251 is about 20704.2809824442. The cubic root of 428667251 is about 754.0036275556.

The spelling of 428667251 in words is "four hundred twenty-eight million, six hundred sixty-seven thousand, two hundred fifty-one".