1523553511421 has 2 divisors, whose sum is σ = 1523553511422. Its totient is φ = 1523553511420.

The previous prime is 1523553511409. The next prime is 1523553511429. The reversal of 1523553511421 is 1241153553251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 877762872100 + 645790639321 = 936890^2 + 803611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1523553511421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1523553511429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761776755710 + 761776755711.

It is an arithmetic number, because the mean of its divisors is an integer number (761776755711).

Almost surely, 2^{1523553511421} is an apocalyptic number.

It is an amenable number.

1523553511421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1523553511421 is an equidigital number, since it uses as much as digits as its factorization.

1523553511421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90000, while the sum is 38.

The spelling of 1523553511421 in words is "one trillion, five hundred twenty-three billion, five hundred fifty-three million, five hundred eleven thousand, four hundred twenty-one".