1345515421 has 4 divisors (see below), whose sum is σ = 1359386812. Its totient is φ = 1331644032.

The previous prime is 1345515403. The next prime is 1345515461. The reversal of 1345515421 is 1245155431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1245155431 = 13 ⋅95781187.

It can be written as a sum of positive squares in 2 ways, for example, as 396567396 + 948948025 = 19914^2 + 30805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345515421 - 2¹⁷ = 1345384349 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 (1345515461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6935550 + ... + 6935743.

It is an arithmetic number, because the mean of its divisors is an integer number (339846703).

Almost surely, 2^1345515421 is an apocalyptic number.

It is an amenable number.

1345515421 is a deficient number, since it is larger than the sum of its proper divisors (13871391).

1345515421 is an equidigital number, since it uses as much as digits as its factorization.

1345515421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13871390.

The product of its digits is 12000, while the sum is 31.

The square root of 1345515421 is about 36681.2679851719. The cubic root of 1345515421 is about 1103.9842897212.

The spelling of 1345515421 in words is "one billion, three hundred forty-five million, five hundred fifteen thousand, four hundred twenty-one".