612491261 has 2 divisors, whose sum is σ = 612491262. Its totient is φ = 612491260.

The previous prime is 612491237. The next prime is 612491291. The reversal of 612491261 is 162194216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 610584100 + 1907161 = 24710^2 + 1381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-612491261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612491221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306245630 + 306245631.

It is an arithmetic number, because the mean of its divisors is an integer number (306245631).

Almost surely, 2^612491261 is an apocalyptic number.

It is an amenable number.

612491261 is a deficient number, since it is larger than the sum of its proper divisors (1).

612491261 is an equidigital number, since it uses as much as digits as its factorization.

612491261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 612491261 is about 24748.5607864377. The cubic root of 612491261 is about 849.2455871398.

The spelling of 612491261 in words is "six hundred twelve million, four hundred ninety-one thousand, two hundred sixty-one".