2491729 has 2 divisors, whose sum is σ = 2491730. Its totient is φ = 2491728.

The previous prime is 2491711. The next prime is 2491757. The reversal of 2491729 is 9271942.

It is a happy number.

2491729 is an esthetic number in base 15, because in such base its adjacent digits differ by 1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2331729 + 160000 = 1527^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 2491729 - 2²¹ = 394577 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2491694 and 2491703.

It is not a weakly prime, because it can be changed into another prime (2491759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245864 + 1245865.

It is an arithmetic number, because the mean of its divisors is an integer number (1245865).

2^2491729 is an apocalyptic number.

It is an amenable number.

2491729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491729 is an equidigital number, since it uses as much as digits as its factorization.

2491729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 2491729 is about 1578.5211433491. The cubic root of 2491729 is about 135.5710424789.

The spelling of 2491729 in words is "two million, four hundred ninety-one thousand, seven hundred twenty-nine".