138845453 has 2 divisors, whose sum is σ = 138845454. Its totient is φ = 138845452.

The previous prime is 138845449. The next prime is 138845461. The reversal of 138845453 is 354548831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138815524 + 29929 = 11782^2 + 173^2 .

It is a cyclic number.

It is not a de Polignac number, because 138845453 - 2² = 138845449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138845453.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138842453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69422726 + 69422727.

It is an arithmetic number, because the mean of its divisors is an integer number (69422727).

Almost surely, 2^138845453 is an apocalyptic number.

It is an amenable number.

138845453 is a deficient number, since it is larger than the sum of its proper divisors (1).

138845453 is an equidigital number, since it uses as much as digits as its factorization.

138845453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230400, while the sum is 41.

The square root of 138845453 is about 11783.2700469776. The cubic root of 138845453 is about 517.8180925345.

The spelling of 138845453 in words is "one hundred thirty-eight million, eight hundred forty-five thousand, four hundred fifty-three".