123521491 has 2 divisors, whose sum is σ = 123521492. Its totient is φ = 123521490.

The previous prime is 123521483. The next prime is 123521501. The reversal of 123521491 is 194125321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123521491 - 2³ = 123521483 is a prime.

It is a super-3 number, since 3×123521491³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123521441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61760745 + 61760746.

It is an arithmetic number, because the mean of its divisors is an integer number (61760746).

Almost surely, 2^123521491 is an apocalyptic number.

123521491 is a deficient number, since it is larger than the sum of its proper divisors (1).

123521491 is an equidigital number, since it uses as much as digits as its factorization.

123521491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 123521491 is about 11114.0222691877. The cubic root of 123521491 is about 498.0208307819.

The spelling of 123521491 in words is "one hundred twenty-three million, five hundred twenty-one thousand, four hundred ninety-one".