1977961 has 2 divisors, whose sum is σ = 1977962. Its totient is φ = 1977960.

The previous prime is 1977953. The next prime is 1977971. The reversal of 1977961 is 1697791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1265625 + 712336 = 1125^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1977961 - 2³ = 1977953 is a prime.

1977961 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1977971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988980 + 988981.

It is an arithmetic number, because the mean of its divisors is an integer number (988981).

2^1977961 is an apocalyptic number.

It is an amenable number.

1977961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977961 is an equidigital number, since it uses as much as digits as its factorization.

1977961 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 1977961 is about 1406.4000142207. The cubic root of 1977961 is about 125.5276046006.

The spelling of 1977961 in words is "one million, nine hundred seventy-seven thousand, nine hundred sixty-one".