1251041551 has 4 divisors (see below), whose sum is σ = 1266877600. Its totient is φ = 1235205504.

The previous prime is 1251041501. The next prime is 1251041573. The reversal of 1251041551 is 1551401521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1251041551 - 2⁹ = 1251041039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251041501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7917906 + ... + 7918063.

It is an arithmetic number, because the mean of its divisors is an integer number (316719400).

Almost surely, 2^1251041551 is an apocalyptic number.

1251041551 is a deficient number, since it is larger than the sum of its proper divisors (15836049).

1251041551 is an equidigital number, since it uses as much as digits as its factorization.

1251041551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15836048.

The product of its (nonzero) digits is 1000, while the sum is 25.

The square root of 1251041551 is about 35370.0657477478. The cubic root of 1251041551 is about 1077.5164557683.

The spelling of 1251041551 in words is "one billion, two hundred fifty-one million, forty-one thousand, five hundred fifty-one".