2125571501 has 4 divisors (see below), whose sum is σ = 2198867100. Its totient is φ = 2052275904.

The previous prime is 2125571447. The next prime is 2125571521. The reversal of 2125571501 is 1051755212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1574026276 + 551545225 = 39674^2 + 23485^2 .

It is a cyclic number.

It is not a de Polignac number, because 2125571501 - 2²² = 2121377197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 73295569 = 2125571501 / (2 + 1 + 2 + 5 + 5 + 7 + 1 + 5 + 0 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2125571521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36647756 + ... + 36647813.

It is an arithmetic number, because the mean of its divisors is an integer number (549716775).

Almost surely, 2^2125571501 is an apocalyptic number.

It is an amenable number.

2125571501 is a deficient number, since it is larger than the sum of its proper divisors (73295599).

2125571501 is an equidigital number, since it uses as much as digits as its factorization.

2125571501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73295598.

The product of its (nonzero) digits is 3500, while the sum is 29.

The square root of 2125571501 is about 46103.9206684204. The cubic root of 2125571501 is about 1285.7560391161.

The spelling of 2125571501 in words is "two billion, one hundred twenty-five million, five hundred seventy-one thousand, five hundred one".