2151815001 has 32 divisors (see below), whose sum is σ = 3492004608. Its totient is φ = 1150556160.

The previous prime is 2151814981. The next prime is 2151815009. The reversal of 2151815001 is 1005181512.

It is not a de Polignac number, because 2151815001 - 2¹¹ = 2151812953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2151815009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44341 + ... + 79181.

It is an arithmetic number, because the mean of its divisors is an integer number (109125144).

Almost surely, 2^2151815001 is an apocalyptic number.

2151815001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2151815001 is a deficient number, since it is larger than the sum of its proper divisors (1340189607).

2151815001 is a wasteful number, since it uses less digits than its factorization.

2151815001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35041.

The product of its (nonzero) digits is 400, while the sum is 24.

The square root of 2151815001 is about 46387.6600078081. The cubic root of 2151815001 is about 1291.0259652545.

Adding to 2151815001 its reverse (1005181512), we get a palindrome (3156996513).

The spelling of 2151815001 in words is "two billion, one hundred fifty-one million, eight hundred fifteen thousand, one".