1961613 has 12 divisors (see below), whose sum is σ = 3000348. Its totient is φ = 1230720.

The previous prime is 1961593. The next prime is 1961623. The reversal of 1961613 is 3161691.

It can be written as a sum of positive squares in 2 ways, for example, as 736164 + 1225449 = 858^2 + 1107^2 .

It is not a de Polignac number, because 1961613 - 2⁵ = 1961581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6258 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (250029).

2^1961613 is an apocalyptic number.

It is an amenable number.

1961613 is a deficient number, since it is larger than the sum of its proper divisors (1038735).

1961613 is a wasteful number, since it uses less digits than its factorization.

1961613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12844 (or 12841 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 1961613 is about 1400.5759529565. The cubic root of 1961613 is about 125.1808156528.

The spelling of 1961613 in words is "one million, nine hundred sixty-one thousand, six hundred thirteen".