2529121957 has 4 divisors (see below), whose sum is σ = 2531167756. Its totient is φ = 2527076160.

The previous prime is 2529121921. The next prime is 2529122009. The reversal of 2529121957 is 7591219252.

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 1292474401 + 1236647556 = 35951^2 + 35166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2529121957 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 (2529121157) 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, 1021044 + ... + 1023517.

It is an arithmetic number, because the mean of its divisors is an integer number (632791939).

Almost surely, 2^2529121957 is an apocalyptic number.

It is an amenable number.

2529121957 is a deficient number, since it is larger than the sum of its proper divisors (2045799).

2529121957 is a wasteful number, since it uses less digits than its factorization.

2529121957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045798.

The product of its digits is 113400, while the sum is 43.

The square root of 2529121957 is about 50290.3763855472. The cubic root of 2529121957 is about 1362.4584204352.

The spelling of 2529121957 in words is "two billion, five hundred twenty-nine million, one hundred twenty-one thousand, nine hundred fifty-seven".