251201220727251 has 8 divisors (see below), whose sum is σ = 339933990238144. Its totient is φ = 164967965850600.

The previous prime is 251201220727243. The next prime is 251201220727267. The reversal of 251201220727251 is 152727022102152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 251201220727251 - 2³ = 251201220727243 is a prime.

It is a super-2 number, since 2×251201220727251² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251201220737251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 624878658325 + ... + 624878658726.

It is an arithmetic number, because the mean of its divisors is an integer number (42491748779768).

Almost surely, 2^{251201220727251} is an apocalyptic number.

251201220727251 is a deficient number, since it is larger than the sum of its proper divisors (88732769510893).

251201220727251 is a wasteful number, since it uses less digits than its factorization.

251201220727251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249757317121.

The product of its (nonzero) digits is 78400, while the sum is 39.

The spelling of 251201220727251 in words is "two hundred fifty-one trillion, two hundred one billion, two hundred twenty million, seven hundred twenty-seven thousand, two hundred fifty-one".