612420251 has 2 divisors, whose sum is σ = 612420252. Its totient is φ = 612420250.

The previous prime is 612420209. The next prime is 612420253. The reversal of 612420251 is 152024216.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-612420251 is a prime.

Together with 612420253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (612420253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306210125 + 306210126.

It is an arithmetic number, because the mean of its divisors is an integer number (306210126).

Almost surely, 2^612420251 is an apocalyptic number.

612420251 is a deficient number, since it is larger than the sum of its proper divisors (1).

612420251 is an equidigital number, since it uses as much as digits as its factorization.

612420251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 612420251 is about 24747.1261159756. The cubic root of 612420251 is about 849.2127663941.

Adding to 612420251 its reverse (152024216), we get a palindrome (764444467).

The spelling of 612420251 in words is "six hundred twelve million, four hundred twenty thousand, two hundred fifty-one".