1305123497 has 2 divisors, whose sum is σ = 1305123498. Its totient is φ = 1305123496.

The previous prime is 1305123493. The next prime is 1305123557. The reversal of 1305123497 is 7943215031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1046910736 + 258212761 = 32356^2 + 16069^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305123497 - 2² = 1305123493 is a prime.

It is not a weakly prime, because it can be changed into another prime (1305123493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652561748 + 652561749.

It is an arithmetic number, because the mean of its divisors is an integer number (652561749).

Almost surely, 2^1305123497 is an apocalyptic number.

It is an amenable number.

1305123497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305123497 is an equidigital number, since it uses as much as digits as its factorization.

1305123497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 1305123497 is about 36126.4930072101. The cubic root of 1305123497 is about 1092.8247851710.

The spelling of 1305123497 in words is "one billion, three hundred five million, one hundred twenty-three thousand, four hundred ninety-seven".