2145323731 has 4 divisors (see below), whose sum is σ = 2156439592. Its totient is φ = 2134207872.

The previous prime is 2145323723. The next prime is 2145323759. The reversal of 2145323731 is 1373235412.

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 2145323731 - 2³ = 2145323723 is a prime.

It is a super-2 number, since 2×2145323731² = 9204827821583520722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2145323693 and 2145323702.

It is not an unprimeable number, because it can be changed into a prime (2145327731) 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, 5557641 + ... + 5558026.

It is an arithmetic number, because the mean of its divisors is an integer number (539109898).

Almost surely, 2^2145323731 is an apocalyptic number.

2145323731 is a deficient number, since it is larger than the sum of its proper divisors (11115861).

2145323731 is a wasteful number, since it uses less digits than its factorization.

2145323731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11115860.

The product of its digits is 15120, while the sum is 31.

The square root of 2145323731 is about 46317.6395231881. The cubic root of 2145323731 is about 1289.7264670525.

The spelling of 2145323731 in words is "two billion, one hundred forty-five million, three hundred twenty-three thousand, seven hundred thirty-one".