2154244551 has 4 divisors (see below), whose sum is σ = 2872326072. Its totient is φ = 1436163032.

The previous prime is 2154244549. The next prime is 2154244553. The reversal of 2154244551 is 1554424512.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (2154244549) and next prime (2154244553).

It is a cyclic number.

It is not a de Polignac number, because 2154244551 - 2¹ = 2154244549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154244553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359040756 + ... + 359040761.

It is an arithmetic number, because the mean of its divisors is an integer number (718081518).

Almost surely, 2^2154244551 is an apocalyptic number.

2154244551 is a deficient number, since it is larger than the sum of its proper divisors (718081521).

2154244551 is an equidigital number, since it uses as much as digits as its factorization.

2154244551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718081520.

The product of its digits is 32000, while the sum is 33.

The square root of 2154244551 is about 46413.8400803036. The cubic root of 2154244551 is about 1291.5116687788.

The spelling of 2154244551 in words is "two billion, one hundred fifty-four million, two hundred forty-four thousand, five hundred fifty-one".