1216961 has 2 divisors, whose sum is σ = 1216962. Its totient is φ = 1216960.

The previous prime is 1216951. The next prime is 1216973. The reversal of 1216961 is 1696121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1168561 + 48400 = 1081^2 + 220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216961 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1216961.

It is not a weakly prime, because it can be changed into another prime (1216951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608480 + 608481.

It is an arithmetic number, because the mean of its divisors is an integer number (608481).

2^1216961 is an apocalyptic number.

It is an amenable number.

1216961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216961 is an equidigital number, since it uses as much as digits as its factorization.

1216961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 1216961 is about 1103.1595532832. The cubic root of 1216961 is about 106.7641762422.

The spelling of 1216961 in words is "one million, two hundred sixteen thousand, nine hundred sixty-one".