1296617345 has 4 divisors (see below), whose sum is σ = 1555940820. Its totient is φ = 1037293872.

The previous prime is 1296617339. The next prime is 1296617351. The reversal of 1296617345 is 5437166921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5437166921 = 131 ⋅41505091.

It is an interprime number because it is at equal distance from previous prime (1296617339) and next prime (1296617351).

It can be written as a sum of positive squares in 2 ways, for example, as 574512961 + 722104384 = 23969^2 + 26872^2 .

It is a cyclic number.

It is not a de Polignac number, because 1296617345 - 2¹² = 1296613249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1296617296 and 1296617305.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129661730 + ... + 129661739.

It is an arithmetic number, because the mean of its divisors is an integer number (388985205).

Almost surely, 2^1296617345 is an apocalyptic number.

It is an amenable number.

1296617345 is a deficient number, since it is larger than the sum of its proper divisors (259323475).

1296617345 is an equidigital number, since it uses as much as digits as its factorization.

1296617345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259323474.

The product of its digits is 272160, while the sum is 44.

The square root of 1296617345 is about 36008.5732152775. The cubic root of 1296617345 is about 1090.4454440078.

The spelling of 1296617345 in words is "one billion, two hundred ninety-six million, six hundred seventeen thousand, three hundred forty-five".