2001522154 has 4 divisors (see below), whose sum is σ = 3002283234. Its totient is φ = 1000761076.

The previous prime is 2001522143. The next prime is 2001522181. The reversal of 2001522154 is 4512251002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1842383929 + 159138225 = 42923^2 + 12615^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500380537 + ... + 500380540.

Almost surely, 2^2001522154 is an apocalyptic number.

2001522154 is a deficient number, since it is larger than the sum of its proper divisors (1000761080).

2001522154 is a wasteful number, since it uses less digits than its factorization.

2001522154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000761079.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2001522154 is about 44738.3745122685. The cubic root of 2001522154 is about 1260.2406011518.

Adding to 2001522154 its reverse (4512251002), we get a palindrome (6513773156).

The spelling of 2001522154 in words is "two billion, one million, five hundred twenty-two thousand, one hundred fifty-four".