154640521 has 8 divisors (see below), whose sum is σ = 180339200. Its totient is φ = 132548724.

The previous prime is 154640503. The next prime is 154640543. The reversal of 154640521 is 125046451.

It is not a de Polignac number, because 154640521 - 2⁹ = 154640009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 154640521.

It is not an unprimeable number, because it can be changed into a prime (154640821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225081 + ... + 225766.

It is an arithmetic number, because the mean of its divisors is an integer number (22542400).

Almost surely, 2^154640521 is an apocalyptic number.

It is an amenable number.

154640521 is a deficient number, since it is larger than the sum of its proper divisors (25698679).

154640521 is an frugal number, since it uses more digits than its factorization.

154640521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450868 (or 450854 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 154640521 is about 12435.4541935548. The cubic root of 154640521 is about 536.7529434909.

Adding to 154640521 its reverse (125046451), we get a palindrome (279686972).

The spelling of 154640521 in words is "one hundred fifty-four million, six hundred forty thousand, five hundred twenty-one".