612221651 has 2 divisors, whose sum is σ = 612221652. Its totient is φ = 612221650.

The previous prime is 612221641. The next prime is 612221677. The reversal of 612221651 is 156122216.

It is an a-pointer prime, because the next prime (612221677) can be obtained adding 612221651 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 612221651 - 2⁶ = 612221587 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 612221651.

It is not a weakly prime, because it can be changed into another prime (612221641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306110825 + 306110826.

It is an arithmetic number, because the mean of its divisors is an integer number (306110826).

Almost surely, 2^612221651 is an apocalyptic number.

612221651 is a deficient number, since it is larger than the sum of its proper divisors (1).

612221651 is an equidigital number, since it uses as much as digits as its factorization.

612221651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 612221651 is about 24743.1132034754. The cubic root of 612221651 is about 849.1209602152.

Adding to 612221651 its reverse (156122216), we get a palindrome (768343867).

The spelling of 612221651 in words is "six hundred twelve million, two hundred twenty-one thousand, six hundred fifty-one".