1251994834 has 8 divisors (see below), whose sum is σ = 1959644160. Its totient is φ = 598780116.

The previous prime is 1251994831. The next prime is 1251994841. The reversal of 1251994834 is 4384991521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (46), and also a Moran number because the ratio is a prime number: 27217279 = 1251994834 / (1 + 2 + 5 + 1 + 9 + 9 + 4 + 8 + 3 + 4).

It is not an unprimeable number, because it can be changed into a prime (1251994831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13608594 + ... + 13608685.

It is an arithmetic number, because the mean of its divisors is an integer number (244955520).

Almost surely, 2^1251994834 is an apocalyptic number.

1251994834 is a deficient number, since it is larger than the sum of its proper divisors (707649326).

1251994834 is a wasteful number, since it uses less digits than its factorization.

1251994834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27217304.

The product of its digits is 311040, while the sum is 46.

The square root of 1251994834 is about 35383.5390259369. The cubic root of 1251994834 is about 1077.7900724010.

The spelling of 1251994834 in words is "one billion, two hundred fifty-one million, nine hundred ninety-four thousand, eight hundred thirty-four".