1297634265 has 12 divisors (see below), whose sum is σ = 2249232804. Its totient is φ = 692071584.

The previous prime is 1297634251. The next prime is 1297634321. The reversal of 1297634265 is 5624367921.

1297634265 is a `hidden beast` number, since 1 + 2 + 9 + 7 + 634 + 2 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 627652809 + 669981456 = 25053^2 + 25884^2 .

It is not a de Polignac number, because 1297634265 - 2⁴ = 1297634249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 28836317 = 1297634265 / (1 + 2 + 9 + 7 + 6 + 3 + 4 + 2 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1297634265.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14418114 + ... + 14418203.

It is an arithmetic number, because the mean of its divisors is an integer number (187436067).

Almost surely, 2^1297634265 is an apocalyptic number.

1297634265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1297634265 is a deficient number, since it is larger than the sum of its proper divisors (951598539).

1297634265 is a wasteful number, since it uses less digits than its factorization.

1297634265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28836328 (or 28836325 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 1297634265 is about 36022.6909738848. The cubic root of 1297634265 is about 1090.7304435398.

The spelling of 1297634265 in words is "one billion, two hundred ninety-seven million, six hundred thirty-four thousand, two hundred sixty-five".