2145020531 has 4 divisors (see below), whose sum is σ = 2180184864. Its totient is φ = 2109856200.

The previous prime is 2145020473. The next prime is 2145020587. The reversal of 2145020531 is 1350205412.

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 2145020531 - 2²² = 2140826227 is a prime.

It is a super-2 number, since 2×2145020531² = 9202226156823043922, 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 = 2145020497 and 2145020506.

It is not an unprimeable number, because it can be changed into a prime (2145010531) 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, 17582075 + ... + 17582196.

It is an arithmetic number, because the mean of its divisors is an integer number (545046216).

Almost surely, 2^2145020531 is an apocalyptic number.

2145020531 is a deficient number, since it is larger than the sum of its proper divisors (35164333).

2145020531 is an equidigital number, since it uses as much as digits as its factorization.

2145020531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35164332.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2145020531 is about 46314.3663564557. The cubic root of 2145020531 is about 1289.6657048960.

Adding to 2145020531 its reverse (1350205412), we get a palindrome (3495225943).

The spelling of 2145020531 in words is "two billion, one hundred forty-five million, twenty thousand, five hundred thirty-one".