15201961 has 4 divisors (see below), whose sum is σ = 16096212. Its totient is φ = 14307712.

The previous prime is 15201947. The next prime is 15201971. The reversal of 15201961 is 16910251.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4840000 + 10361961 = 2200^2 + 3219^2 .

It is a cyclic number.

It is not a de Polignac number, because 15201961 - 2⁹ = 15201449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15201941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447100 + ... + 447133.

It is an arithmetic number, because the mean of its divisors is an integer number (4024053).

Almost surely, 2^15201961 is an apocalyptic number.

It is an amenable number.

15201961 is a deficient number, since it is larger than the sum of its proper divisors (894251).

15201961 is an equidigital number, since it uses as much as digits as its factorization.

15201961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894250.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 15201961 is about 3898.9692227562. The cubic root of 15201961 is about 247.7231181904.

It can be divided in two parts, 1520 and 1961, that added together give a square (3481 = 59²).

The spelling of 15201961 in words is "fifteen million, two hundred one thousand, nine hundred sixty-one".