977273981 has 2 divisors, whose sum is σ = 977273982. Its totient is φ = 977273980.

The previous prime is 977273971. The next prime is 977273989. The reversal of 977273981 is 189372779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 958212025 + 19061956 = 30955^2 + 4366^2 .

It is a cyclic number.

It is not a de Polignac number, because 977273981 - 2¹⁰ = 977272957 is a prime.

It is a super-2 number, since 2×977273981² = 1910128867879176722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (977273989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488636990 + 488636991.

It is an arithmetic number, because the mean of its divisors is an integer number (488636991).

Almost surely, 2^977273981 is an apocalyptic number.

It is an amenable number.

977273981 is a deficient number, since it is larger than the sum of its proper divisors (1).

977273981 is an equidigital number, since it uses as much as digits as its factorization.

977273981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 53.

The square root of 977273981 is about 31261.3816233384. The cubic root of 977273981 is about 992.3665388711.

The spelling of 977273981 in words is "nine hundred seventy-seven million, two hundred seventy-three thousand, nine hundred eighty-one".