139454521 has 2 divisors, whose sum is σ = 139454522. Its totient is φ = 139454520.

The previous prime is 139454477. The next prime is 139454531. The reversal of 139454521 is 125454931.

139454521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71639296 + 67815225 = 8464^2 + 8235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139454521 is a prime.

It is not a weakly prime, because it can be changed into another prime (139454531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69727260 + 69727261.

It is an arithmetic number, because the mean of its divisors is an integer number (69727261).

Almost surely, 2^139454521 is an apocalyptic number.

It is an amenable number.

139454521 is a deficient number, since it is larger than the sum of its proper divisors (1).

139454521 is an equidigital number, since it uses as much as digits as its factorization.

139454521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 139454521 is about 11809.0863744830. The cubic root of 139454521 is about 518.5741523100.

The spelling of 139454521 in words is "one hundred thirty-nine million, four hundred fifty-four thousand, five hundred twenty-one".