12920961 has 4 divisors (see below), whose sum is σ = 17227952. Its totient is φ = 8613972.

The previous prime is 12920951. The next prime is 12920977. The reversal of 12920961 is 16902921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12920961 - 2¹³ = 12912769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12920951) 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, 2153491 + ... + 2153496.

It is an arithmetic number, because the mean of its divisors is an integer number (4306988).

Almost surely, 2^12920961 is an apocalyptic number.

It is an amenable number.

12920961 is a deficient number, since it is larger than the sum of its proper divisors (4306991).

12920961 is an equidigital number, since it uses as much as digits as its factorization.

12920961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306990.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 12920961 is about 3594.5738273125. The cubic root of 12920961 is about 234.6559686049.

The spelling of 12920961 in words is "twelve million, nine hundred twenty thousand, nine hundred sixty-one".