75245813 has 4 divisors (see below), whose sum is σ = 75288108. Its totient is φ = 75203520.

The previous prime is 75245771. The next prime is 75245837. The reversal of 75245813 is 31854257.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31854257 = 89 ⋅357913.

It can be written as a sum of positive squares in 2 ways, for example, as 3301489 + 71944324 = 1817^2 + 8482^2 .

It is a cyclic number.

It is not a de Polignac number, because 75245813 - 2¹⁶ = 75180277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75245873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18356 + ... + 22077.

It is an arithmetic number, because the mean of its divisors is an integer number (18822027).

Almost surely, 2^75245813 is an apocalyptic number.

It is an amenable number.

75245813 is a deficient number, since it is larger than the sum of its proper divisors (42295).

75245813 is a wasteful number, since it uses less digits than its factorization.

75245813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42294.

The product of its digits is 33600, while the sum is 35.

The square root of 75245813 is about 8674.4344484237. The cubic root of 75245813 is about 422.1765562517.

Subtracting from 75245813 its sum of digits (35), we obtain a triangular number (75245778 = T₁₂₂₆₇).

The spelling of 75245813 in words is "seventy-five million, two hundred forty-five thousand, eight hundred thirteen".