15920101 has 12 divisors (see below), whose sum is σ = 16968420. Its totient is φ = 14918400.

The previous prime is 15920089. The next prime is 15920123. The reversal of 15920101 is 10102951.

It is a Cunningham number, because it is equal to 3990²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 8352100 + 7568001 = 2890^2 + 2751^2 .

It is not a de Polignac number, because 15920101 - 2¹⁷ = 15789029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15920131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39501 + ... + 39901.

It is an arithmetic number, because the mean of its divisors is an integer number (1414035).

Almost surely, 2^15920101 is an apocalyptic number.

It is an amenable number.

15920101 is a deficient number, since it is larger than the sum of its proper divisors (1048319).

15920101 is an equidigital number, since it uses as much as digits as its factorization.

15920101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 15920101 is about 3990.0001253133. Note that the first 3 decimals coincide. The cubic root of 15920101 is about 251.5640663791.

The spelling of 15920101 in words is "fifteen million, nine hundred twenty thousand, one hundred one".