1601961091 has 2 divisors, whose sum is σ = 1601961092. Its totient is φ = 1601961090.

The previous prime is 1601961083. The next prime is 1601961103. The reversal of 1601961091 is 1901691061.

It is a weak prime.

It is an emirp because it is prime and its reverse (1901691061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1601961091 - 2³ = 1601961083 is a prime.

It is a super-3 number, since 3×1601961091³ (a number of 29 digits) contains 333 as substring.

1601961091 is a strobogrammatic number because it is the same when read upside-down.

It is not a weakly prime, because it can be changed into another prime (1601961191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800980545 + 800980546.

It is an arithmetic number, because the mean of its divisors is an integer number (800980546).

Almost surely, 2^1601961091 is an apocalyptic number.

1601961091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601961091 is an equidigital number, since it uses as much as digits as its factorization.

1601961091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 1601961091 is about 40024.5061306195. The cubic root of 1601961091 is about 1170.0847555909.

The spelling of 1601961091 in words is "one billion, six hundred one million, nine hundred sixty-one thousand, ninety-one".