2867551981 has 6 divisors (see below), whose sum is σ = 3335723790. Its totient is φ = 2457901656.

The previous prime is 2867551963. The next prime is 2867551997. The reversal of 2867551981 is 1891557682.

It can be written as a sum of positive squares in only one way, i.e., 2802749481 + 64802500 = 52941^2 + 8050^2 .

It is not a de Polignac number, because 2867551981 - 2⁵ = 2867551949 is a prime.

It is a super-2 number, since 2×2867551981² = 16445708727474048722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2867551081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29260686 + ... + 29260783.

It is an arithmetic number, because the mean of its divisors is an integer number (555953965).

Almost surely, 2^2867551981 is an apocalyptic number.

It is an amenable number.

2867551981 is a deficient number, since it is larger than the sum of its proper divisors (468171809).

2867551981 is an equidigital number, since it uses as much as digits as its factorization.

2867551981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58521483 (or 58521476 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 52.

The square root of 2867551981 is about 53549.5282985761. The cubic root of 2867551981 is about 1420.7045338430.

It can be divided in two parts, 28675 and 51981, that added together give a square (80656 = 284²).

The spelling of 2867551981 in words is "two billion, eight hundred sixty-seven million, five hundred fifty-one thousand, nine hundred eighty-one".