2154243501 has 6 divisors (see below), whose sum is σ = 3111685070. Its totient is φ = 1436162328.

The previous prime is 2154243499. The next prime is 2154243521. The reversal of 2154243501 is 1053424512.

2154243501 is a `hidden beast` number, since 2 + 154 + 2 + 4 + 3 + 501 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1110888900 + 1043354601 = 33330^2 + 32301^2 .

It is not a de Polignac number, because 2154243501 - 2¹ = 2154243499 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154243521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119680186 + ... + 119680203.

Almost surely, 2^2154243501 is an apocalyptic number.

It is an amenable number.

2154243501 is a deficient number, since it is larger than the sum of its proper divisors (957441569).

2154243501 is a wasteful number, since it uses less digits than its factorization.

2154243501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239360395 (or 239360392 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 2154243501 is about 46413.8287690210. The cubic root of 2154243501 is about 1291.5114589469.

The spelling of 2154243501 in words is "two billion, one hundred fifty-four million, two hundred forty-three thousand, five hundred one".