3125545681 has 4 divisors (see below), whose sum is σ = 3126071664. Its totient is φ = 3125019700.

The previous prime is 3125545607. The next prime is 3125545723. The reversal of 3125545681 is 1865455213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3125545681 - 2¹⁵ = 3125512913 is a prime.

It is a super-2 number, since 2×3125545681² = 19538071608035507522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3125545981) 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, 253975 + ... + 265996.

It is an arithmetic number, because the mean of its divisors is an integer number (781517916).

Almost surely, 2^3125545681 is an apocalyptic number.

It is an amenable number.

3125545681 is a deficient number, since it is larger than the sum of its proper divisors (525983).

3125545681 is an equidigital number, since it uses as much as digits as its factorization.

3125545681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525982.

The product of its digits is 144000, while the sum is 40.

The square root of 3125545681 is about 55906.5799436882. The cubic root of 3125545681 is about 1462.0939618030.

The spelling of 3125545681 in words is "three billion, one hundred twenty-five million, five hundred forty-five thousand, six hundred eighty-one".