2145551044 has 144 divisors (see below), whose sum is σ = 5070836736. Its totient is φ = 785030400.

The previous prime is 2145551029. The next prime is 2145551069. The reversal of 2145551044 is 4401555412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 2145550997 and 2145551015.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1816134 + ... + 1817314.

It is an arithmetic number, because the mean of its divisors is an integer number (35214144).

Almost surely, 2^2145551044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2145551044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2535418368).

2145551044 is an abundant number, since it is smaller than the sum of its proper divisors (2925285692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2145551044 is a wasteful number, since it uses less digits than its factorization.

2145551044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266 (or 1257 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 31.

The square root of 2145551044 is about 46320.0933073326. The cubic root of 2145551044 is about 1289.7720174798.

The spelling of 2145551044 in words is "two billion, one hundred forty-five million, five hundred fifty-one thousand, forty-four".