1251213033 has 16 divisors (see below), whose sum is σ = 1972356480. Its totient is φ = 690324096.

The previous prime is 1251212993. The next prime is 1251213037. The reversal of 1251213033 is 3303121521.

It is a de Polignac number, because none of the positive numbers 2^k-1251213033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1251213037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1026660 + ... + 1027877.

It is an arithmetic number, because the mean of its divisors is an integer number (123272280).

Almost surely, 2^1251213033 is an apocalyptic number.

It is an amenable number.

1251213033 is a deficient number, since it is larger than the sum of its proper divisors (721143447).

1251213033 is a wasteful number, since it uses less digits than its factorization.

1251213033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054576.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1251213033 is about 35372.4897766612. The cubic root of 1251213033 is about 1077.5656857439.

Adding to 1251213033 its reverse (3303121521), we get a palindrome (4554334554).

The spelling of 1251213033 in words is "one billion, two hundred fifty-one million, two hundred thirteen thousand, thirty-three".