2281015981 has 2 divisors, whose sum is σ = 2281015982. Its totient is φ = 2281015980.

The previous prime is 2281015973. The next prime is 2281015999. The reversal of 2281015981 is 1895101822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1744398756 + 536617225 = 41766^2 + 23165^2 .

It is a cyclic number.

It is not a de Polignac number, because 2281015981 - 2³ = 2281015973 is a prime.

It is a super-2 number, since 2×2281015981² = 10406067811154784722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2281015981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2281015081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1140507990 + 1140507991.

It is an arithmetic number, because the mean of its divisors is an integer number (1140507991).

Almost surely, 2^2281015981 is an apocalyptic number.

It is an amenable number.

2281015981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2281015981 is an equidigital number, since it uses as much as digits as its factorization.

2281015981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 2281015981 is about 47759.9830506670. The cubic root of 2281015981 is about 1316.3643414686.

The spelling of 2281015981 in words is "two billion, two hundred eighty-one million, fifteen thousand, nine hundred eighty-one".