2891378232101 has 2 divisors, whose sum is σ = 2891378232102. Its totient is φ = 2891378232100.

The previous prime is 2891378232097. The next prime is 2891378232131. The reversal of 2891378232101 is 1012328731982.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1551641431201 + 1339736800900 = 1245649^2 + 1157470^2 .

It is a cyclic number.

It is not a de Polignac number, because 2891378232101 - 2² = 2891378232097 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2891378232131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1445689116050 + 1445689116051.

It is an arithmetic number, because the mean of its divisors is an integer number (1445689116051).

Almost surely, 2^{2891378232101} is an apocalyptic number.

It is an amenable number.

2891378232101 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891378232101 is an equidigital number, since it uses as much as digits as its factorization.

2891378232101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 2891378232101 in words is "two trillion, eight hundred ninety-one billion, three hundred seventy-eight million, two hundred thirty-two thousand, one hundred one".