251222071 has 4 divisors (see below), whose sum is σ = 252177552. Its totient is φ = 250266592.

The previous prime is 251222057. The next prime is 251222087. The reversal of 251222071 is 170222152.

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

It is not a de Polignac number, because 251222071 - 2⁹ = 251221559 is a prime.

It is a super-2 number, since 2×251222071² = 126225057915058082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251222021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477346 + ... + 477871.

It is an arithmetic number, because the mean of its divisors is an integer number (63044388).

Almost surely, 2^251222071 is an apocalyptic number.

251222071 is a deficient number, since it is larger than the sum of its proper divisors (955481).

251222071 is an equidigital number, since it uses as much as digits as its factorization.

251222071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955480.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 251222071 is about 15849.9864668712. The cubic root of 251222071 is about 630.9853322255.

The spelling of 251222071 in words is "two hundred fifty-one million, two hundred twenty-two thousand, seventy-one".