1391334545 has 4 divisors (see below), whose sum is σ = 1669601460. Its totient is φ = 1113067632.

The previous prime is 1391334541. The next prime is 1391334547. The reversal of 1391334545 is 5454331931.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 694796881 + 696537664 = 26359^2 + 26392^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391334545 - 2² = 1391334541 is a prime.

It is a super-2 number, since 2×1391334545² = 3871623632220714050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1391334499 and 1391334508.

It is not an unprimeable number, because it can be changed into a prime (1391334541) 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, 139133450 + ... + 139133459.

It is an arithmetic number, because the mean of its divisors is an integer number (417400365).

Almost surely, 2^1391334545 is an apocalyptic number.

It is an amenable number.

1391334545 is a deficient number, since it is larger than the sum of its proper divisors (278266915).

1391334545 is an equidigital number, since it uses as much as digits as its factorization.

1391334545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278266914.

The product of its digits is 97200, while the sum is 38.

The square root of 1391334545 is about 37300.5971131831. The cubic root of 1391334545 is about 1116.3760805727.

The spelling of 1391334545 in words is "one billion, three hundred ninety-one million, three hundred thirty-four thousand, five hundred forty-five".