2149786531 has 4 divisors (see below), whose sum is σ = 2166714112. Its totient is φ = 2132858952.

The previous prime is 2149786523. The next prime is 2149786549. The reversal of 2149786531 is 1356879412.

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

It is a cyclic number.

It is not a de Polignac number, because 2149786531 - 2³ = 2149786523 is a prime.

It is a super-2 number, since 2×2149786531² = 9243164257738027922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2149786031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8463600 + ... + 8463853.

It is an arithmetic number, because the mean of its divisors is an integer number (541678528).

Almost surely, 2^2149786531 is an apocalyptic number.

2149786531 is a deficient number, since it is larger than the sum of its proper divisors (16927581).

2149786531 is a wasteful number, since it uses less digits than its factorization.

2149786531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16927580.

The product of its digits is 362880, while the sum is 46.

The square root of 2149786531 is about 46365.7905249118. The cubic root of 2149786531 is about 1290.6201635216.

The spelling of 2149786531 in words is "two billion, one hundred forty-nine million, seven hundred eighty-six thousand, five hundred thirty-one".