13721497 has 2 divisors, whose sum is σ = 13721498. Its totient is φ = 13721496.

The previous prime is 13721479. The next prime is 13721527. The reversal of 13721497 is 79412731.

Together with previous prime (13721479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10265616 + 3455881 = 3204^2 + 1859^2 .

It is a cyclic number.

It is not a de Polignac number, because 13721497 - 2⁷ = 13721369 is a prime.

It is not a weakly prime, because it can be changed into another prime (13721447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6860748 + 6860749.

It is an arithmetic number, because the mean of its divisors is an integer number (6860749).

Almost surely, 2^13721497 is an apocalyptic number.

It is an amenable number.

13721497 is a deficient number, since it is larger than the sum of its proper divisors (1).

13721497 is an equidigital number, since it uses as much as digits as its factorization.

13721497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 34.

The square root of 13721497 is about 3704.2539059843. The cubic root of 13721497 is about 239.4053391364.

The spelling of 13721497 in words is "thirteen million, seven hundred twenty-one thousand, four hundred ninety-seven".