13538731 has 2 divisors, whose sum is σ = 13538732. Its totient is φ = 13538730.

The previous prime is 13538729. The next prime is 13538779. The reversal of 13538731 is 13783531.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13538731 - 2¹ = 13538729 is a prime.

It is a super-2 number, since 2×13538731² = 366594474180722, which contains 22 as substring.

Together with 13538729, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13538693 and 13538702.

It is not a weakly prime, because it can be changed into another prime (13538131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6769365 + 6769366.

It is an arithmetic number, because the mean of its divisors is an integer number (6769366).

Almost surely, 2^13538731 is an apocalyptic number.

13538731 is a deficient number, since it is larger than the sum of its proper divisors (1).

13538731 is an equidigital number, since it uses as much as digits as its factorization.

13538731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 13538731 is about 3679.5014607960. The cubic root of 13538731 is about 238.3376501193.

The spelling of 13538731 in words is "thirteen million, five hundred thirty-eight thousand, seven hundred thirty-one".