1651161181 has 2 divisors, whose sum is σ = 1651161182. Its totient is φ = 1651161180.

The previous prime is 1651161167. The next prime is 1651161233. The reversal of 1651161181 is 1811611561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1464592900 + 186568281 = 38270^2 + 13659^2 .

It is an emirp because it is prime and its reverse (1811611561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1651161181 - 2⁹ = 1651160669 is a prime.

It is a super-2 number, since 2×1651161181² = 5452666491282629522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1651161151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825580590 + 825580591.

It is an arithmetic number, because the mean of its divisors is an integer number (825580591).

Almost surely, 2^1651161181 is an apocalyptic number.

It is an amenable number.

1651161181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651161181 is an equidigital number, since it uses as much as digits as its factorization.

1651161181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 31.

The square root of 1651161181 is about 40634.4826594359. The cubic root of 1651161181 is about 1181.9428830063.

The spelling of 1651161181 in words is "one billion, six hundred fifty-one million, one hundred sixty-one thousand, one hundred eighty-one".