1251450251 has 4 divisors (see below), whose sum is σ = 1253472600. Its totient is φ = 1249427904.

The previous prime is 1251450163. The next prime is 1251450259. The reversal of 1251450251 is 1520541521.

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

It is a cyclic number.

It is not a de Polignac number, because 1251450251 - 2²⁶ = 1184341387 is a prime.

It is a super-2 number, since 2×1251450251² = 3132255461455926002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1251450251.

It is not an unprimeable number, because it can be changed into a prime (1251450259) 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, 1010246 + ... + 1011483.

It is an arithmetic number, because the mean of its divisors is an integer number (313368150).

Almost surely, 2^1251450251 is an apocalyptic number.

1251450251 is a deficient number, since it is larger than the sum of its proper divisors (2022349).

1251450251 is an equidigital number, since it uses as much as digits as its factorization.

1251450251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022348.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1251450251 is about 35375.8427602792. The cubic root of 1251450251 is about 1077.6337801498.

Adding to 1251450251 its reverse (1520541521), we get a palindrome (2771991772).

The spelling of 1251450251 in words is "one billion, two hundred fifty-one million, four hundred fifty thousand, two hundred fifty-one".