169125813 has 28 divisors (see below), whose sum is σ = 256194828. Its totient is φ = 111585600.

The previous prime is 169125793. The next prime is 169125833. The reversal of 169125813 is 318521961.

169125813 is a `hidden beast` number, since 1 + 69 + 12 + 581 + 3 = 666.

169125813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (169125793) and next prime (169125833).

It can be written as a sum of positive squares in 2 ways, for example, as 129208689 + 39917124 = 11367^2 + 6318^2 .

It is not a de Polignac number, because 169125813 - 2¹³ = 169117621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169125833) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 72481 + ... + 74777.

Almost surely, 2^169125813 is an apocalyptic number.

It is an amenable number.

169125813 is a deficient number, since it is larger than the sum of its proper divisors (87069015).

169125813 is an equidigital number, since it uses as much as digits as its factorization.

169125813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416 (or 2401 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 169125813 is about 13004.8380612755. The cubic root of 169125813 is about 553.0146449191.

The spelling of 169125813 in words is "one hundred sixty-nine million, one hundred twenty-five thousand, eight hundred thirteen".