3123201521491 has 2 divisors, whose sum is σ = 3123201521492. Its totient is φ = 3123201521490.

The previous prime is 3123201521411. The next prime is 3123201521501. The reversal of 3123201521491 is 1941251023213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3123201521491 - 2⁹ = 3123201520979 is a prime.

It is not a weakly prime, because it can be changed into another prime (3123201521411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1561600760745 + 1561600760746.

It is an arithmetic number, because the mean of its divisors is an integer number (1561600760746).

Almost surely, 2^{3123201521491} is an apocalyptic number.

3123201521491 is a deficient number, since it is larger than the sum of its proper divisors (1).

3123201521491 is an equidigital number, since it uses as much as digits as its factorization.

3123201521491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 3123201521491 in words is "three trillion, one hundred twenty-three billion, two hundred one million, five hundred twenty-one thousand, four hundred ninety-one".