726645131 has 2 divisors, whose sum is σ = 726645132. Its totient is φ = 726645130.

The previous prime is 726645107. The next prime is 726645133. The reversal of 726645131 is 131546627.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726645131 is a prime.

It is a super-2 number, since 2×726645131² = 1056026292812014322, which contains 22 as substring.

Together with 726645133, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 726645091 and 726645100.

It is not a weakly prime, because it can be changed into another prime (726645133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363322565 + 363322566.

It is an arithmetic number, because the mean of its divisors is an integer number (363322566).

Almost surely, 2^726645131 is an apocalyptic number.

726645131 is a deficient number, since it is larger than the sum of its proper divisors (1).

726645131 is an equidigital number, since it uses as much as digits as its factorization.

726645131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 726645131 is about 26956.3560408301. The cubic root of 726645131 is about 899.0298727640.

The spelling of 726645131 in words is "seven hundred twenty-six million, six hundred forty-five thousand, one hundred thirty-one".