1155401527421 has 2 divisors, whose sum is σ = 1155401527422. Its totient is φ = 1155401527420.

The previous prime is 1155401527411. The next prime is 1155401527451. The reversal of 1155401527421 is 1247251045511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1091316604921 + 64084922500 = 1044661^2 + 253150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155401527421 is a prime.

It is a super-2 number, since 2×1155401527421² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155401527411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577700763710 + 577700763711.

It is an arithmetic number, because the mean of its divisors is an integer number (577700763711).

Almost surely, 2^{1155401527421} is an apocalyptic number.

It is an amenable number.

1155401527421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155401527421 is an equidigital number, since it uses as much as digits as its factorization.

1155401527421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56000, while the sum is 38.

The spelling of 1155401527421 in words is "one trillion, one hundred fifty-five billion, four hundred one million, five hundred twenty-seven thousand, four hundred twenty-one".