121896961 has 4 divisors (see below), whose sum is σ = 122281812. Its totient is φ = 121512112.

The previous prime is 121896949. The next prime is 121896967. The reversal of 121896961 is 169698121.

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 63297936 + 58599025 = 7956^2 + 7655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121896961 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121896967) 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, 191950 + ... + 192583.

It is an arithmetic number, because the mean of its divisors is an integer number (30570453).

It is a Proth number, since it is equal to 465 ⋅ 2¹⁸ + 1 and 465 < 2¹⁸.

Almost surely, 2^121896961 is an apocalyptic number.

It is an amenable number.

121896961 is a deficient number, since it is larger than the sum of its proper divisors (384851).

121896961 is an equidigital number, since it uses as much as digits as its factorization.

121896961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384850.

The product of its digits is 46656, while the sum is 43.

The square root of 121896961 is about 11040.6956755451. The cubic root of 121896961 is about 495.8278986356.

The spelling of 121896961 in words is "one hundred twenty-one million, eight hundred ninety-six thousand, nine hundred sixty-one".