1651606081 has 2 divisors, whose sum is σ = 1651606082. Its totient is φ = 1651606080.

The previous prime is 1651606067. The next prime is 1651606091. The reversal of 1651606081 is 1806061561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1550784400 + 100821681 = 39380^2 + 10041^2 .

It is a cyclic number.

It is not a de Polignac number, because 1651606081 - 2¹⁷ = 1651475009 is a prime.

It is a super-2 number, since 2×1651606081² = 5455605293592357122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1651606031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825803040 + 825803041.

It is an arithmetic number, because the mean of its divisors is an integer number (825803041).

Almost surely, 2^1651606081 is an apocalyptic number.

It is an amenable number.

1651606081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651606081 is an equidigital number, since it uses as much as digits as its factorization.

1651606081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1651606081 is about 40639.9567051935. The cubic root of 1651606081 is about 1182.0490303594.

The spelling of 1651606081 in words is "one billion, six hundred fifty-one million, six hundred six thousand, eighty-one".