2591056042 has 4 divisors (see below), whose sum is σ = 3886584066. Its totient is φ = 1295528020.

The previous prime is 2591056033. The next prime is 2591056051. The reversal of 2591056042 is 2406501952.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (2591056033) and next prime (2591056051).

It can be written as a sum of positive squares in only one way, i.e., 2561473321 + 29582721 = 50611^2 + 5439^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2591055989 and 2591056007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647764009 + ... + 647764012.

Almost surely, 2^2591056042 is an apocalyptic number.

2591056042 is a deficient number, since it is larger than the sum of its proper divisors (1295528024).

2591056042 is a wasteful number, since it uses less digits than its factorization.

2591056042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295528023.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 2591056042 is about 50902.4168581414. The cubic root of 2591056042 is about 1373.4903173962.

Adding to 2591056042 its reverse (2406501952), we get a palindrome (4997557994).

The spelling of 2591056042 in words is "two billion, five hundred ninety-one million, fifty-six thousand, forty-two".