2303216551981 has 2 divisors, whose sum is σ = 2303216551982. Its totient is φ = 2303216551980.

The previous prime is 2303216551969. The next prime is 2303216552011. The reversal of 2303216551981 is 1891556123032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1751255222500 + 551961329481 = 1323350^2 + 742941^2 .

It is a cyclic number.

It is not a de Polignac number, because 2303216551981 - 2²¹ = 2303214454829 is a prime.

It is a super-2 number, since 2×2303216551981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2303216551931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1151608275990 + 1151608275991.

It is an arithmetic number, because the mean of its divisors is an integer number (1151608275991).

Almost surely, 2^{2303216551981} is an apocalyptic number.

It is an amenable number.

2303216551981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2303216551981 is an equidigital number, since it uses as much as digits as its factorization.

2303216551981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 2303216551981 in words is "two trillion, three hundred three billion, two hundred sixteen million, five hundred fifty-one thousand, nine hundred eighty-one".