1345231973 has 4 divisors (see below), whose sum is σ = 1345305900. Its totient is φ = 1345158048.

The previous prime is 1345231969. The next prime is 1345231997. The reversal of 1345231973 is 3791325431.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 382867489 + 962364484 = 19567^2 + 31022^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345231973 - 2² = 1345231969 is a prime.

It is a super-3 number, since 3×1345231973³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345231933) 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, 11603 + ... + 53151.

It is an arithmetic number, because the mean of its divisors is an integer number (336326475).

Almost surely, 2^1345231973 is an apocalyptic number.

It is an amenable number.

1345231973 is a deficient number, since it is larger than the sum of its proper divisors (73927).

1345231973 is an equidigital number, since it uses as much as digits as its factorization.

1345231973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73926.

The product of its digits is 68040, while the sum is 38.

The square root of 1345231973 is about 36677.4041202482. The cubic root of 1345231973 is about 1103.9067620293.

The spelling of 1345231973 in words is "one billion, three hundred forty-five million, two hundred thirty-one thousand, nine hundred seventy-three".