2145581629 has 4 divisors (see below), whose sum is σ = 2145832576. Its totient is φ = 2145330684.

The previous prime is 2145581597. The next prime is 2145581653. The reversal of 2145581629 is 9261855412.

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 not a de Polignac number, because 2145581629 - 2⁵ = 2145581597 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 (2145581429) 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, 112179 + ... + 129904.

It is an arithmetic number, because the mean of its divisors is an integer number (536458144).

Almost surely, 2^2145581629 is an apocalyptic number.

It is an amenable number.

2145581629 is a deficient number, since it is larger than the sum of its proper divisors (250947).

2145581629 is an equidigital number, since it uses as much as digits as its factorization.

2145581629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250946.

The product of its digits is 172800, while the sum is 43.

The square root of 2145581629 is about 46320.4234544547. The cubic root of 2145581629 is about 1289.7781460515.

The spelling of 2145581629 in words is "two billion, one hundred forty-five million, five hundred eighty-one thousand, six hundred twenty-nine".