2129173544 has 8 divisors (see below), whose sum is σ = 3992200410. Its totient is φ = 1064586768.

The previous prime is 2129173531. The next prime is 2129173567. The reversal of 2129173544 is 4453719212.

It can be written as a sum of positive squares in only one way, i.e., 1659584644 + 469588900 = 40738^2 + 21670^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 2129173498 and 2129173507.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133073339 + ... + 133073354.

Almost surely, 2^2129173544 is an apocalyptic number.

It is an amenable number.

2129173544 is a deficient number, since it is larger than the sum of its proper divisors (1863026866).

2129173544 is a wasteful number, since it uses less digits than its factorization.

2129173544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266146699 (or 266146695 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 2129173544 is about 46142.9685217585. The cubic root of 2129173544 is about 1286.4819199546.

The spelling of 2129173544 in words is "two billion, one hundred twenty-nine million, one hundred seventy-three thousand, five hundred forty-four".