2731672121557 has 2 divisors, whose sum is σ = 2731672121558. Its totient is φ = 2731672121556.

The previous prime is 2731672121551. The next prime is 2731672121561. The reversal of 2731672121557 is 7551212761372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2486831226961 + 244840894596 = 1576969^2 + 494814^2 .

It is a cyclic number.

It is not a de Polignac number, because 2731672121557 - 2⁷ = 2731672121429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2731672121557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2731672121551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365836060778 + 1365836060779.

It is an arithmetic number, because the mean of its divisors is an integer number (1365836060779).

Almost surely, 2^{2731672121557} is an apocalyptic number.

It is an amenable number.

2731672121557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2731672121557 is an equidigital number, since it uses as much as digits as its factorization.

2731672121557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1234800, while the sum is 49.

The spelling of 2731672121557 in words is "two trillion, seven hundred thirty-one billion, six hundred seventy-two million, one hundred twenty-one thousand, five hundred fifty-seven".