612398261 has 2 divisors, whose sum is σ = 612398262. Its totient is φ = 612398260.

The previous prime is 612398243. The next prime is 612398309. The reversal of 612398261 is 162893216.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 606686161 + 5712100 = 24631^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 612398261 - 2⁶ = 612398197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612398221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306199130 + 306199131.

It is an arithmetic number, because the mean of its divisors is an integer number (306199131).

Almost surely, 2^612398261 is an apocalyptic number.

It is an amenable number.

612398261 is a deficient number, since it is larger than the sum of its proper divisors (1).

612398261 is an equidigital number, since it uses as much as digits as its factorization.

612398261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 612398261 is about 24746.6818179731. The cubic root of 612398261 is about 849.2026021252.

The spelling of 612398261 in words is "six hundred twelve million, three hundred ninety-eight thousand, two hundred sixty-one".