2145540041 has 4 divisors (see below), whose sum is σ = 2149006800. Its totient is φ = 2142073284.

The previous prime is 2145539987. The next prime is 2145540043. The reversal of 2145540041 is 1400455412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145540041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145540043) 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, 1732451 + ... + 1733688.

It is an arithmetic number, because the mean of its divisors is an integer number (537251700).

Almost surely, 2^2145540041 is an apocalyptic number.

It is an amenable number.

2145540041 is a deficient number, since it is larger than the sum of its proper divisors (3466759).

2145540041 is an equidigital number, since it uses as much as digits as its factorization.

2145540041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3466758.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 2145540041 is about 46319.9745358307. The cubic root of 2145540041 is about 1289.7698127027.

Adding to 2145540041 its reverse (1400455412), we get a palindrome (3545995453).

The spelling of 2145540041 in words is "two billion, one hundred forty-five million, five hundred forty thousand, forty-one".