2151505251 has 12 divisors (see below), whose sum is σ = 3551691312.
Its totient is φ = 1229431536.
The previous prime is 2151505247. The next prime is 2151505271. The reversal of 2151505251 is 1525051512.
2151505251 is a `hidden beast` number, since 2 + 151 + 505 + 2 + 5 + 1 = 666.
It is not a de Polignac number, because 2151505251 - 22 = 2151505247 is a prime.
It is not an unprimeable number, because it can be changed into a prime (2151505271) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17075376 + ... + 17075501.
It is an arithmetic number, because the mean of its divisors is an integer number (295974276).
Almost surely, 22151505251 is an apocalyptic number.
2151505251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.
2151505251 is a deficient number, since it is larger than the sum of its proper divisors (1400186061).
2151505251 is a wasteful number, since it uses less digits than its factorization.
2151505251 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 34150890 (or 34150887 counting only the distinct ones).
The product of its (nonzero) digits is 2500, while the sum is 27.
The square root of 2151505251 is about 46384.3211764493.
The cubic root of 2151505251 is about 1290.9640153064.
Adding to 2151505251 its reverse (1525051512), we get a palindrome (3676556763).
The spelling of 2151505251 in words is "two billion, one hundred fifty-one million, five hundred five thousand, two hundred fifty-one".