1251101543311 has 2 divisors, whose sum is σ = 1251101543312. Its totient is φ = 1251101543310.

The previous prime is 1251101543257. The next prime is 1251101543317. The reversal of 1251101543311 is 1133451011521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251101543311 - 2⁷ = 1251101543183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1251101543311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251101543317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625550771655 + 625550771656.

It is an arithmetic number, because the mean of its divisors is an integer number (625550771656).

Almost surely, 2^{1251101543311} is an apocalyptic number.

1251101543311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251101543311 is an equidigital number, since it uses as much as digits as its factorization.

1251101543311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 1251101543311 its reverse (1133451011521), we get a palindrome (2384552554832).

The spelling of 1251101543311 in words is "one trillion, two hundred fifty-one billion, one hundred one million, five hundred forty-three thousand, three hundred eleven".