1251125442 has 24 divisors (see below), whose sum is σ = 3098025216. Its totient is φ = 357464376.

The previous prime is 1251125441. The next prime is 1251125443. The reversal of 1251125442 is 2445211521.

It is a happy number.

1251125442 is a `hidden beast` number, since 1 + 2 + 5 + 112 + 544 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1251125441) and next prime (1251125443).

It is not an unprimeable number, because it can be changed into a prime (1251125441) 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, 4964658 + ... + 4964909.

It is an arithmetic number, because the mean of its divisors is an integer number (129084384).

Almost surely, 2^1251125442 is an apocalyptic number.

1251125442 is an abundant number, since it is smaller than the sum of its proper divisors (1846899774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251125442 is a wasteful number, since it uses less digits than its factorization.

1251125442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9929582 (or 9929579 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 1251125442 is about 35371.2516317984. The cubic root of 1251125442 is about 1077.5405402102.

Adding to 1251125442 its reverse (2445211521), we get a palindrome (3696336963).

The spelling of 1251125442 in words is "one billion, two hundred fifty-one million, one hundred twenty-five thousand, four hundred forty-two".