1961217 has 12 divisors (see below), whose sum is σ = 2845440. Its totient is φ = 1301688.

The previous prime is 1961213. The next prime is 1961221. The reversal of 1961217 is 7121691.

It is an interprime number because it is at equal distance from previous prime (1961213) and next prime (1961221).

It is not a de Polignac number, because 1961217 - 2² = 1961213 is a prime.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (1961213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2928 + ... + 3534.

It is an arithmetic number, because the mean of its divisors is an integer number (237120).

2^1961217 is an apocalyptic number.

It is an amenable number.

1961217 is a deficient number, since it is larger than the sum of its proper divisors (884223).

1961217 is a wasteful number, since it uses less digits than its factorization.

1961217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972 (or 969 counting only the distinct ones).

The product of its digits is 756, while the sum is 27.

The square root of 1961217 is about 1400.4345754086. The cubic root of 1961217 is about 125.1723914735.

Subtracting from 1961217 its sum of digits (27), we obtain a triangular number (1961190 = T₁₉₈₀).

The spelling of 1961217 in words is "one million, nine hundred sixty-one thousand, two hundred seventeen".