3891513245 has 4 divisors (see below), whose sum is σ = 4669815900. Its totient is φ = 3113210592.

The previous prime is 3891513211. The next prime is 3891513259. The reversal of 3891513245 is 5423151983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5423151983 = 103 ⋅52651961.

It can be written as a sum of positive squares in 2 ways, for example, as 523219876 + 3368293369 = 22874^2 + 58037^2 .

It is a cyclic number.

It is not a de Polignac number, because 3891513245 - 2¹⁰ = 3891512221 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389151320 + ... + 389151329.

It is an arithmetic number, because the mean of its divisors is an integer number (1167453975).

Almost surely, 2^3891513245 is an apocalyptic number.

It is an amenable number.

3891513245 is a deficient number, since it is larger than the sum of its proper divisors (778302655).

3891513245 is an equidigital number, since it uses as much as digits as its factorization.

3891513245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778302654.

The product of its digits is 129600, while the sum is 41.

The square root of 3891513245 is about 62381.9945577247. The cubic root of 3891513245 is about 1572.9183208212.

The spelling of 3891513245 in words is "three billion, eight hundred ninety-one million, five hundred thirteen thousand, two hundred forty-five".