677031991 has 2 divisors, whose sum is σ = 677031992. Its totient is φ = 677031990.

The previous prime is 677031977. The next prime is 677032001. The reversal of 677031991 is 199130776.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 677031991 - 2¹³ = 677023799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677031961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338515995 + 338515996.

It is an arithmetic number, because the mean of its divisors is an integer number (338515996).

Almost surely, 2^677031991 is an apocalyptic number.

677031991 is a deficient number, since it is larger than the sum of its proper divisors (1).

677031991 is an equidigital number, since it uses as much as digits as its factorization.

677031991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442, while the sum is 43.

The square root of 677031991 is about 26019.8384122577. The cubic root of 677031991 is about 878.0846734030.

The spelling of 677031991 in words is "six hundred seventy-seven million, thirty-one thousand, nine hundred ninety-one".