1251040242 has 64 divisors (see below), whose sum is σ = 2659184640. Its totient is φ = 391569024.

The previous prime is 1251040223. The next prime is 1251040261. The reversal of 1251040242 is 2420401521.

It is an interprime number because it is at equal distance from previous prime (1251040223) and next prime (1251040261).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2737278 + ... + 2737734.

It is an arithmetic number, because the mean of its divisors is an integer number (41549760).

Almost surely, 2^1251040242 is an apocalyptic number.

1251040242 is an abundant number, since it is smaller than the sum of its proper divisors (1408144398).

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

1251040242 is a wasteful number, since it uses less digits than its factorization.

1251040242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1251040242 is about 35370.0472433951. The cubic root of 1251040242 is about 1077.5160799563.

Adding to 1251040242 its reverse (2420401521), we get a palindrome (3671441763).

The spelling of 1251040242 in words is "one billion, two hundred fifty-one million, forty thousand, two hundred forty-two".