2529179981 has 48 divisors (see below), whose sum is σ = 2965082112. Its totient is φ = 2144862720.

The previous prime is 2529179971. The next prime is 2529180007. The reversal of 2529179981 is 1899719252.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-2529179981 is a prime.

It is a super-2 number, since 2×2529179981² = 12793502752582320722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2529179971) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19914740 + ... + 19914866.

It is an arithmetic number, because the mean of its divisors is an integer number (61772544).

Almost surely, 2^2529179981 is an apocalyptic number.

It is an amenable number.

2529179981 is a deficient number, since it is larger than the sum of its proper divisors (435902131).

2529179981 is a wasteful number, since it uses less digits than its factorization.

2529179981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 251 counting only the distinct ones).

The product of its digits is 816480, while the sum is 53.

The square root of 2529179981 is about 50290.9532719355. The cubic root of 2529179981 is about 1362.4688396880.

The spelling of 2529179981 in words is "two billion, five hundred twenty-nine million, one hundred seventy-nine thousand, nine hundred eighty-one".