1601691011 has 2 divisors, whose sum is σ = 1601691012. Its totient is φ = 1601691010.

The previous prime is 1601690983. The next prime is 1601691031. The reversal of 1601691011 is 1101961061.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1601691011 - 2⁶ = 1601690947 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1601691031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800845505 + 800845506.

It is an arithmetic number, because the mean of its divisors is an integer number (800845506).

Almost surely, 2^1601691011 is an apocalyptic number.

1601691011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601691011 is an equidigital number, since it uses as much as digits as its factorization.

1601691011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 1601691011 is about 40021.1320554529. The cubic root of 1601691011 is about 1170.0189957225.

The spelling of 1601691011 in words is "one billion, six hundred one million, six hundred ninety-one thousand, eleven".