977644331 has 2 divisors, whose sum is σ = 977644332. Its totient is φ = 977644330.

The previous prime is 977644309. The next prime is 977644351. The reversal of 977644331 is 133446779.

It is a strong prime.

It is an emirp because it is prime and its reverse (133446779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 977644331 - 2¹⁴ = 977627947 is a prime.

It is a super-2 number, since 2×977644331² = 1911576875872875122, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (977644351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488822165 + 488822166.

It is an arithmetic number, because the mean of its divisors is an integer number (488822166).

Almost surely, 2^977644331 is an apocalyptic number.

977644331 is a deficient number, since it is larger than the sum of its proper divisors (1).

977644331 is an equidigital number, since it uses as much as digits as its factorization.

977644331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 44.

The square root of 977644331 is about 31267.3045048658. The cubic root of 977644331 is about 992.4918795428.

The spelling of 977644331 in words is "nine hundred seventy-seven million, six hundred forty-four thousand, three hundred thirty-one".