977748491 has 16 divisors (see below), whose sum is σ = 1013126400. Its totient is φ = 943034400.

The previous prime is 977748479. The next prime is 977748511. The reversal of 977748491 is 194847779.

It is a cyclic number.

It is not a de Polignac number, because 977748491 - 2¹⁸ = 977486347 is a prime.

It is a super-2 number, since 2×977748491² = 1911984223305554162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977748451) 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 15 ways as a sum of consecutive naturals, for example, 1394441 + ... + 1395141.

It is an arithmetic number, because the mean of its divisors is an integer number (63320400).

Almost surely, 2^977748491 is an apocalyptic number.

977748491 is a deficient number, since it is larger than the sum of its proper divisors (35377909).

977748491 is a wasteful number, since it uses less digits than its factorization.

977748491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106.

The product of its digits is 3556224, while the sum is 56.

The square root of 977748491 is about 31268.9700981660. The cubic root of 977748491 is about 992.5271255860.

The spelling of 977748491 in words is "nine hundred seventy-seven million, seven hundred forty-eight thousand, four hundred ninety-one".