1312354661 has 24 divisors (see below), whose sum is σ = 1461703320. Its totient is φ = 1172785152.

The previous prime is 1312354649. The next prime is 1312354663. The reversal of 1312354661 is 1664532131.

It can be written as a sum of positive squares in 4 ways, for example, as 431392900 + 880961761 = 20770^2 + 29681^2 .

It is not a de Polignac number, because 1312354661 - 2²⁶ = 1245245797 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 (1312354663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2212781 + ... + 2213373.

It is an arithmetic number, because the mean of its divisors is an integer number (60904305).

Almost surely, 2^1312354661 is an apocalyptic number.

It is an amenable number.

1312354661 is a deficient number, since it is larger than the sum of its proper divisors (149348659).

1312354661 is an equidigital number, since it uses as much as digits as its factorization.

1312354661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 706 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 1312354661 is about 36226.4359411742. The cubic root of 1312354661 is about 1094.8393698337.

Adding to 1312354661 its reverse (1664532131), we get a palindrome (2976886792).

The spelling of 1312354661 in words is "one billion, three hundred twelve million, three hundred fifty-four thousand, six hundred sixty-one".