1523457491 has 2 divisors, whose sum is σ = 1523457492. Its totient is φ = 1523457490.

The previous prime is 1523457473. The next prime is 1523457527. The reversal of 1523457491 is 1947543251.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1523457491 - 2¹⁸ = 1523195347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1523457451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761728745 + 761728746.

It is an arithmetic number, because the mean of its divisors is an integer number (761728746).

Almost surely, 2^1523457491 is an apocalyptic number.

1523457491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1523457491 is an equidigital number, since it uses as much as digits as its factorization.

1523457491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 41.

The square root of 1523457491 is about 39031.4935789037. The cubic root of 1523457491 is about 1150.6505433300.

The spelling of 1523457491 in words is "one billion, five hundred twenty-three million, four hundred fifty-seven thousand, four hundred ninety-one".