2561551031 has 8 divisors (see below), whose sum is σ = 2775519600. Its totient is φ = 2350000512.

The previous prime is 2561550989. The next prime is 2561551037. The reversal of 2561551031 is 1301551652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2561551031 - 2⁶ = 2561550967 is a prime.

It is a super-2 number, since 2×2561551031² = 13123087368834325922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2561550985 and 2561551003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561551037) 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 7 ways as a sum of consecutive naturals, for example, 602306 + ... + 606543.

It is an arithmetic number, because the mean of its divisors is an integer number (346939950).

Almost surely, 2^2561551031 is an apocalyptic number.

2561551031 is a deficient number, since it is larger than the sum of its proper divisors (213968569).

2561551031 is a wasteful number, since it uses less digits than its factorization.

2561551031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209025.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 2561551031 is about 50611.7677126575. The cubic root of 2561551031 is about 1368.2569750754.

The spelling of 2561551031 in words is "two billion, five hundred sixty-one million, five hundred fifty-one thousand, thirty-one".