1299521477 has 2 divisors, whose sum is σ = 1299521478. Its totient is φ = 1299521476.

The previous prime is 1299521423. The next prime is 1299521501. The reversal of 1299521477 is 7741259921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1205547841 + 93973636 = 34721^2 + 9694^2 .

It is a cyclic number.

It is not a de Polignac number, because 1299521477 - 2⁸ = 1299521221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299529477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649760738 + 649760739.

It is an arithmetic number, because the mean of its divisors is an integer number (649760739).

Almost surely, 2^1299521477 is an apocalyptic number.

It is an amenable number.

1299521477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299521477 is an equidigital number, since it uses as much as digits as its factorization.

1299521477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 47.

The square root of 1299521477 is about 36048.8762238159. The cubic root of 1299521477 is about 1091.2589546791.

The spelling of 1299521477 in words is "one billion, two hundred ninety-nine million, five hundred twenty-one thousand, four hundred seventy-seven".