11391463861 has 4 divisors (see below), whose sum is σ = 11392108000. Its totient is φ = 11390819724.

The previous prime is 11391463859. The next prime is 11391463957. The reversal of 11391463861 is 16836419311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16836419311 = 1489 ⋅11307199.

It is a cyclic number.

It is not a de Polignac number, because 11391463861 - 2¹ = 11391463859 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 (11391463561) 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, 294771 + ... + 331168.

It is an arithmetic number, because the mean of its divisors is an integer number (2848027000).

Almost surely, 2^11391463861 is an apocalyptic number.

It is an amenable number.

11391463861 is a deficient number, since it is larger than the sum of its proper divisors (644139).

11391463861 is an equidigital number, since it uses as much as digits as its factorization.

11391463861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644138.

The product of its digits is 93312, while the sum is 43.

The spelling of 11391463861 in words is "eleven billion, three hundred ninety-one million, four hundred sixty-three thousand, eight hundred sixty-one".