651161869 has 4 divisors (see below), whose sum is σ = 663447996. Its totient is φ = 638875744.

The previous prime is 651161867. The next prime is 651161879. The reversal of 651161869 is 968161156.

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

It can be written as a sum of positive squares in 2 ways, for example, as 421275625 + 229886244 = 20525^2 + 15162^2 .

It is a cyclic number.

It is not a de Polignac number, because 651161869 - 2¹ = 651161867 is a prime.

It is a super-2 number, since 2×651161869² = 848023559279146322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651161867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6142984 + ... + 6143089.

It is an arithmetic number, because the mean of its divisors is an integer number (165861999).

Almost surely, 2^651161869 is an apocalyptic number.

It is an amenable number.

651161869 is a deficient number, since it is larger than the sum of its proper divisors (12286127).

651161869 is a wasteful number, since it uses less digits than its factorization.

651161869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12286126.

The product of its digits is 77760, while the sum is 43.

The square root of 651161869 is about 25517.8735203386. The cubic root of 651161869 is about 866.7549295874.

The spelling of 651161869 in words is "six hundred fifty-one million, one hundred sixty-one thousand, eight hundred sixty-nine".