731626261 has 2 divisors, whose sum is σ = 731626262. Its totient is φ = 731626260.

The previous prime is 731626249. The next prime is 731626267. The reversal of 731626261 is 162626137.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654080625 + 77545636 = 25575^2 + 8806^2 .

It is a cyclic number.

It is not a de Polignac number, because 731626261 - 2⁹ = 731625749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (731626267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365813130 + 365813131.

It is an arithmetic number, because the mean of its divisors is an integer number (365813131).

Almost surely, 2^731626261 is an apocalyptic number.

It is an amenable number.

731626261 is a deficient number, since it is larger than the sum of its proper divisors (1).

731626261 is an equidigital number, since it uses as much as digits as its factorization.

731626261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 731626261 is about 27048.5907396300. The cubic root of 731626261 is about 901.0794705962.

The spelling of 731626261 in words is "seven hundred thirty-one million, six hundred twenty-six thousand, two hundred sixty-one".