2561012139 has 16 divisors (see below), whose sum is σ = 3942729728. Its totient is φ = 1448347392.

The previous prime is 2561012137. The next prime is 2561012159. The reversal of 2561012139 is 9312101652.

It is not a de Polignac number, because 2561012139 - 2¹ = 2561012137 is a prime.

It is a super-2 number, since 2×2561012139² = 13117566352210710642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2561012131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 626587 + ... + 630660.

It is an arithmetic number, because the mean of its divisors is an integer number (246420608).

Almost surely, 2^2561012139 is an apocalyptic number.

2561012139 is a deficient number, since it is larger than the sum of its proper divisors (1381717589).

2561012139 is a wasteful number, since it uses less digits than its factorization.

2561012139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257354.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 2561012139 is about 50606.4436509818. The cubic root of 2561012139 is about 1368.1610183104.

The spelling of 2561012139 in words is "two billion, five hundred sixty-one million, twelve thousand, one hundred thirty-nine".