19512961 has 4 divisors (see below), whose sum is σ = 21013972. Its totient is φ = 18011952.

The previous prime is 19512937. The next prime is 19512971. The reversal of 19512961 is 16921591.

It is a happy number.

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 3352561 + 16160400 = 1831^2 + 4020^2 .

It is a cyclic number.

It is not a de Polignac number, because 19512961 - 2¹³ = 19504769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19512931) 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, 750486 + ... + 750511.

It is an arithmetic number, because the mean of its divisors is an integer number (5253493).

Almost surely, 2^19512961 is an apocalyptic number.

It is an amenable number.

19512961 is a deficient number, since it is larger than the sum of its proper divisors (1501011).

19512961 is a wasteful number, since it uses less digits than its factorization.

19512961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501010.

The product of its digits is 4860, while the sum is 34.

The square root of 19512961 is about 4417.3477336519. The cubic root of 19512961 is about 269.2202514300.

The spelling of 19512961 in words is "nineteen million, five hundred twelve thousand, nine hundred sixty-one".