101604991 has 2 divisors, whose sum is σ = 101604992. Its totient is φ = 101604990.

The previous prime is 101604983. The next prime is 101605003. The reversal of 101604991 is 199406101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101604991 - 2³ = 101604983 is a prime.

It is a super-2 number, since 2×101604991² = 20647148392220162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101604911) 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 as a sum of consecutive naturals, namely, 50802495 + 50802496.

It is an arithmetic number, because the mean of its divisors is an integer number (50802496).

Almost surely, 2^101604991 is an apocalyptic number.

101604991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101604991 is an equidigital number, since it uses as much as digits as its factorization.

101604991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 101604991 is about 10079.9301088847. The cubic root of 101604991 is about 466.6289514305.

It can be divided in two parts, 10160 and 4991, that added together give a palindrome (15151).

The spelling of 101604991 in words is "one hundred one million, six hundred four thousand, nine hundred ninety-one".