2151550040 has 32 divisors (see below), whose sum is σ = 4997151360. Its totient is φ = 832857600.

The previous prime is 2151550013. The next prime is 2151550043. The reversal of 2151550040 is 400551512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2151549988 and 2151550015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151550043) 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 7 ways as a sum of consecutive naturals, for example, 866321 + ... + 868800.

It is an arithmetic number, because the mean of its divisors is an integer number (156160980).

Almost surely, 2^2151550040 is an apocalyptic number.

2151550040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2151550040 is an abundant number, since it is smaller than the sum of its proper divisors (2845601320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2151550040 is a wasteful number, since it uses less digits than its factorization.

2151550040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735163 (or 1735159 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 2151550040 is about 46384.8039771648. The cubic root of 2151550040 is about 1290.9729734666.

The spelling of 2151550040 in words is "two billion, one hundred fifty-one million, five hundred fifty thousand, forty".