977641 has 4 divisors (see below), whose sum is σ = 1117312. Its totient is φ = 837972.

The previous prime is 977629. The next prime is 977671. The reversal of 977641 is 146779.

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: 146779 = 37 ⋅3967.

It is a cyclic number.

It is not a de Polignac number, because 977641 - 2⁵ = 977609 is a prime.

977641 is a lucky number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 977597 and 977606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977611) 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, 69825 + ... + 69838.

It is an arithmetic number, because the mean of its divisors is an integer number (279328).

2⁹⁷⁷⁶⁴¹ is an apocalyptic number.

It is an amenable number.

977641 is a deficient number, since it is larger than the sum of its proper divisors (139671).

977641 is a wasteful number, since it uses less digits than its factorization.

977641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139670.

The product of its digits is 10584, while the sum is 34.

The square root of 977641 is about 988.7573008580. The cubic root of 977641 is about 99.2490752345.

The spelling of 977641 in words is "nine hundred seventy-seven thousand, six hundred forty-one".