1961797 has 2 divisors, whose sum is σ = 1961798. Its totient is φ = 1961796.

The previous prime is 1961767. The next prime is 1961819. The reversal of 1961797 is 7971691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1240996 + 720801 = 1114^2 + 849^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961797 - 2⁷ = 1961669 is a prime.

It is a zygodrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980898 + 980899.

It is an arithmetic number, because the mean of its divisors is an integer number (980899).

2^1961797 is an apocalyptic number.

It is an amenable number.

1961797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961797 is an equidigital number, since it uses as much as digits as its factorization.

1961797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 40.

The square root of 1961797 is about 1400.6416386785. The cubic root of 1961797 is about 125.1847295322.

It can be divided in two parts, 19 and 61797, that added together give a palindrome (61816).

The spelling of 1961797 in words is "one million, nine hundred sixty-one thousand, seven hundred ninety-seven".