177042989 has 2 divisors, whose sum is σ = 177042990. Its totient is φ = 177042988.

The previous prime is 177042979. The next prime is 177043019. The reversal of 177042989 is 989240771.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139122025 + 37920964 = 11795^2 + 6158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-177042989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (177042959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 88521494 + 88521495.

It is an arithmetic number, because the mean of its divisors is an integer number (88521495).

Almost surely, 2^177042989 is an apocalyptic number.

It is an amenable number.

177042989 is a deficient number, since it is larger than the sum of its proper divisors (1).

177042989 is an equidigital number, since it uses as much as digits as its factorization.

177042989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 177042989 is about 13305.7502231178. The cubic root of 177042989 is about 561.5126927048.

The spelling of 177042989 in words is "one hundred seventy-seven million, forty-two thousand, nine hundred eighty-nine".