2151545101 has 4 divisors (see below), whose sum is σ = 2151770812. Its totient is φ = 2151319392.

The previous prime is 2151545089. The next prime is 2151545117. The reversal of 2151545101 is 1015451512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1357996201 + 793548900 = 36851^2 + 28170^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151545101 - 2¹⁹ = 2151020813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151545131) 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, 97896 + ... + 117841.

It is an arithmetic number, because the mean of its divisors is an integer number (537942703).

Almost surely, 2^2151545101 is an apocalyptic number.

It is an amenable number.

2151545101 is a deficient number, since it is larger than the sum of its proper divisors (225711).

2151545101 is an equidigital number, since it uses as much as digits as its factorization.

2151545101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225710.

The product of its (nonzero) digits is 1000, while the sum is 25.

The square root of 2151545101 is about 46384.7507377155. The cubic root of 2151545101 is about 1290.9719856330.

Adding to 2151545101 its reverse (1015451512), we get a palindrome (3166996613).

The spelling of 2151545101 in words is "two billion, one hundred fifty-one million, five hundred forty-five thousand, one hundred one".