1296613501 has 4 divisors (see below), whose sum is σ = 1296687004. Its totient is φ = 1296540000.

The previous prime is 1296613469. The next prime is 1296613553. The reversal of 1296613501 is 1053166921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1053166921 = 31033 ⋅33937.

It can be written as a sum of positive squares in 2 ways, for example, as 858548601 + 438064900 = 29301^2 + 20930^2 .

It is a 3-Lehmer number, since φ(1296613501) divides (1296613501-1)³.

It is a cyclic number.

It is not a de Polignac number, because 1296613501 - 2⁵ = 1296613469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296616501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7351 + ... + 51451.

It is an arithmetic number, because the mean of its divisors is an integer number (324171751).

It is a Poulet number, since it divides 2^1296613500-1.

Almost surely, 2^1296613501 is an apocalyptic number.

1296613501 is the 29401-st pentagonal number.

It is an amenable number.

1296613501 is a deficient number, since it is larger than the sum of its proper divisors (73503).

1296613501 is an equidigital number, since it uses as much as digits as its factorization.

1296613501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73502.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1296613501 is about 36008.5198390603. The cubic root of 1296613501 is about 1090.4443664150. Note that the first 3 decimals are identical.

The spelling of 1296613501 in words is "one billion, two hundred ninety-six million, six hundred thirteen thousand, five hundred one".