1521621154 has 16 divisors (see below), whose sum is σ = 2302385400. Its totient is φ = 754185600.

The previous prime is 1521621113. The next prime is 1521621161. The reversal of 1521621154 is 4511261251.

It can be written as a sum of positive squares in 4 ways, for example, as 1503345529 + 18275625 = 38773^2 + 4275^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114454 + ... + 127054.

Almost surely, 2^1521621154 is an apocalyptic number.

1521621154 is a deficient number, since it is larger than the sum of its proper divisors (780764246).

1521621154 is a wasteful number, since it uses less digits than its factorization.

1521621154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13125.

The product of its digits is 2400, while the sum is 28.

The square root of 1521621154 is about 39007.9626999411. The cubic root of 1521621154 is about 1150.1880357933.

The spelling of 1521621154 in words is "one billion, five hundred twenty-one million, six hundred twenty-one thousand, one hundred fifty-four".