1651251251 has 4 divisors (see below), whose sum is σ = 1778270592. Its totient is φ = 1524231912.

The previous prime is 1651251241. The next prime is 1651251253. The reversal of 1651251251 is 1521521561.

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 1651251251 - 2¹⁴ = 1651234867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1651251253) 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, 63509651 + ... + 63509676.

It is an arithmetic number, because the mean of its divisors is an integer number (444567648).

Almost surely, 2^1651251251 is an apocalyptic number.

1651251251 is a deficient number, since it is larger than the sum of its proper divisors (127019341).

1651251251 is a wasteful number, since it uses less digits than its factorization.

1651251251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127019340.

The product of its digits is 3000, while the sum is 29.

The square root of 1651251251 is about 40635.5909394708. The cubic root of 1651251251 is about 1181.9643740759.

The spelling of 1651251251 in words is "one billion, six hundred fifty-one million, two hundred fifty-one thousand, two hundred fifty-one".