13421731 has 2 divisors, whose sum is σ = 13421732. Its totient is φ = 13421730.

The previous prime is 13421717. The next prime is 13421747. The reversal of 13421731 is 13712431.

13421731 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (13712431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13421731 - 2¹³ = 13413539 is a prime.

It is a super-2 number, since 2×13421731² = 360285726072722, which contains 22 as substring.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (13421711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6710865 + 6710866.

It is an arithmetic number, because the mean of its divisors is an integer number (6710866).

Almost surely, 2^13421731 is an apocalyptic number.

13421731 is a deficient number, since it is larger than the sum of its proper divisors (1).

13421731 is an equidigital number, since it uses as much as digits as its factorization.

13421731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 22.

The square root of 13421731 is about 3663.5680695191. The cubic root of 13421731 is about 237.6491015735.

The spelling of 13421731 in words is "thirteen million, four hundred twenty-one thousand, seven hundred thirty-one".