1391149563 has 4 divisors (see below), whose sum is σ = 1854866088. Its totient is φ = 927433040.

The previous prime is 1391149553. The next prime is 1391149577. The reversal of 1391149563 is 3659411931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1391149563 - 2¹² = 1391145467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1391149523) 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, 231858258 + ... + 231858263.

It is an arithmetic number, because the mean of its divisors is an integer number (463716522).

Almost surely, 2^1391149563 is an apocalyptic number.

1391149563 is a deficient number, since it is larger than the sum of its proper divisors (463716525).

1391149563 is an equidigital number, since it uses as much as digits as its factorization.

1391149563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463716524.

The product of its digits is 87480, while the sum is 42.

The square root of 1391149563 is about 37298.1174189797. The cubic root of 1391149563 is about 1116.3266032241.

The spelling of 1391149563 in words is "one billion, three hundred ninety-one million, one hundred forty-nine thousand, five hundred sixty-three".