1251243422 has 16 divisors (see below), whose sum is σ = 2204988912. Its totient is φ = 524997120.

The previous prime is 1251243403. The next prime is 1251243439. The reversal of 1251243422 is 2243421521.

It is a super-2 number, since 2×1251243422² = 3131220202196540168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 1251243391 and 1251243400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2187203 + ... + 2187774.

It is an arithmetic number, because the mean of its divisors is an integer number (137811807).

Almost surely, 2^1251243422 is an apocalyptic number.

1251243422 is a deficient number, since it is larger than the sum of its proper divisors (953745490).

1251243422 is a wasteful number, since it uses less digits than its factorization.

1251243422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375003.

The product of its digits is 3840, while the sum is 26.

The square root of 1251243422 is about 35372.9193310363. The cubic root of 1251243422 is about 1077.5744095124.

Adding to 1251243422 its reverse (2243421521), we get a palindrome (3494664943).

The spelling of 1251243422 in words is "one billion, two hundred fifty-one million, two hundred forty-three thousand, four hundred twenty-two".