1311661641 has 8 divisors (see below), whose sum is σ = 1824920640. Its totient is φ = 836421872.

The previous prime is 1311661621. The next prime is 1311661643. The reversal of 1311661641 is 1461661131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311661641 - 2⁷ = 1311661513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311661599 and 1311661608.

It is not an unprimeable number, because it can be changed into a prime (1311661643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9504726 + ... + 9504863.

It is an arithmetic number, because the mean of its divisors is an integer number (228115080).

Almost surely, 2^1311661641 is an apocalyptic number.

It is an amenable number.

1311661641 is a deficient number, since it is larger than the sum of its proper divisors (513258999).

1311661641 is a wasteful number, since it uses less digits than its factorization.

1311661641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19009615.

The product of its digits is 2592, while the sum is 30.

The square root of 1311661641 is about 36216.8695637820. The cubic root of 1311661641 is about 1094.6466172697.

The spelling of 1311661641 in words is "one billion, three hundred eleven million, six hundred sixty-one thousand, six hundred forty-one".