961977 has 4 divisors (see below), whose sum is σ = 1282640. Its totient is φ = 641316.

The previous prime is 961973. The next prime is 961981. The reversal of 961977 is 779169.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 779169 = 3 ⋅259723.

It is an interprime number because it is at equal distance from previous prime (961973) and next prime (961981).

It is not a de Polignac number, because 961977 - 2² = 961973 is a prime.

It is a D-number.

It is a Duffinian number.

961977 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (961973) 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 in 3 ways as a sum of consecutive naturals, for example, 160327 + ... + 160332.

It is an arithmetic number, because the mean of its divisors is an integer number (320660).

2⁹⁶¹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

961977 is a deficient number, since it is larger than the sum of its proper divisors (320663).

961977 is a wasteful number, since it uses less digits than its factorization.

961977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320662.

The product of its digits is 23814, while the sum is 39.

The square root of 961977 is about 980.8042618178. The cubic root of 961977 is about 98.7161546139.

The spelling of 961977 in words is "nine hundred sixty-one thousand, nine hundred seventy-seven".