172836780461 has 2 divisors, whose sum is σ = 172836780462. Its totient is φ = 172836780460.

The previous prime is 172836780439. The next prime is 172836780499. The reversal of 172836780461 is 164087638271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87882602500 + 84954177961 = 296450^2 + 291469^2 .

It is an emirp because it is prime and its reverse (164087638271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172836780461 - 2¹⁴ = 172836764077 is a prime.

It is a super-2 number, since 2×172836780461² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172836780661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86418390230 + 86418390231.

It is an arithmetic number, because the mean of its divisors is an integer number (86418390231).

Almost surely, 2^172836780461 is an apocalyptic number.

It is an amenable number.

172836780461 is a deficient number, since it is larger than the sum of its proper divisors (1).

172836780461 is an equidigital number, since it uses as much as digits as its factorization.

172836780461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 172836780461 in words is "one hundred seventy-two billion, eight hundred thirty-six million, seven hundred eighty thousand, four hundred sixty-one".