2125549381 has 4 divisors (see below), whose sum is σ = 2126132064. Its totient is φ = 2124966700.

The previous prime is 2125549369. The next prime is 2125549463. The reversal of 2125549381 is 1839455212.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-2125549381 is a prime.

It is a super-2 number, since 2×2125549381² = 9035920342138966322, 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2125540381) 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, 285835 + ... + 293176.

It is an arithmetic number, because the mean of its divisors is an integer number (531533016).

Almost surely, 2^2125549381 is an apocalyptic number.

It is an amenable number.

2125549381 is a deficient number, since it is larger than the sum of its proper divisors (582683).

2125549381 is an equidigital number, since it uses as much as digits as its factorization.

2125549381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582682.

The product of its digits is 86400, while the sum is 40.

The square root of 2125549381 is about 46103.6807749663. The cubic root of 2125549381 is about 1285.7515789788.

The spelling of 2125549381 in words is "two billion, one hundred twenty-five million, five hundred forty-nine thousand, three hundred eighty-one".