2145531404 has 6 divisors (see below), whose sum is σ = 3754679964. Its totient is φ = 1072765700.

The previous prime is 2145531371. The next prime is 2145531407. The reversal of 2145531404 is 4041355412.

It is a super-2 number, since 2×2145531404² = 9206610011100422432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2145531407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268191422 + ... + 268191429.

It is an arithmetic number, because the mean of its divisors is an integer number (625779994).

Almost surely, 2^2145531404 is an apocalyptic number.

It is an amenable number.

2145531404 is a deficient number, since it is larger than the sum of its proper divisors (1609148560).

2145531404 is a wasteful number, since it uses less digits than its factorization.

2145531404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536382855 (or 536382853 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 2145531404 is about 46319.8813038203. The cubic root of 2145531404 is about 1289.7680820185.

Adding to 2145531404 its reverse (4041355412), we get a palindrome (6186886816).

The spelling of 2145531404 in words is "two billion, one hundred forty-five million, five hundred thirty-one thousand, four hundred four".