1961513 has 2 divisors, whose sum is σ = 1961514. Its totient is φ = 1961512.

The previous prime is 1961501. The next prime is 1961527. The reversal of 1961513 is 3151691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1926544 + 34969 = 1388^2 + 187^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961513 - 2⁸ = 1961257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1961593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980756 + 980757.

It is an arithmetic number, because the mean of its divisors is an integer number (980757).

2^1961513 is an apocalyptic number.

It is an amenable number.

1961513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961513 is an equidigital number, since it uses as much as digits as its factorization.

1961513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 26.

The square root of 1961513 is about 1400.5402529024. The cubic root of 1961513 is about 125.1786884418.

The spelling of 1961513 in words is "one million, nine hundred sixty-one thousand, five hundred thirteen".