3551781331129 has 2 divisors, whose sum is σ = 3551781331130. Its totient is φ = 3551781331128.

The previous prime is 3551781331067. The next prime is 3551781331139. The reversal of 3551781331129 is 9211331871553.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2420000253225 + 1131781077904 = 1555635^2 + 1063852^2 .

It is a cyclic number.

It is not a de Polignac number, because 3551781331129 - 2¹¹ = 3551781329081 is a prime.

It is a super-2 number, since 2×3551781331129² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3551781331139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1775890665564 + 1775890665565.

It is an arithmetic number, because the mean of its divisors is an integer number (1775890665565).

Almost surely, 2^{3551781331129} is an apocalyptic number.

It is an amenable number.

3551781331129 is a deficient number, since it is larger than the sum of its proper divisors (1).

3551781331129 is an equidigital number, since it uses as much as digits as its factorization.

3551781331129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 49.

The spelling of 3551781331129 in words is "three trillion, five hundred fifty-one billion, seven hundred eighty-one million, three hundred thirty-one thousand, one hundred twenty-nine".