207761993 has 4 divisors (see below), whose sum is σ = 213377220. Its totient is φ = 202146768.

The previous prime is 207761989. The next prime is 207761999. The reversal of 207761993 is 399167702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399167702 = 2 ⋅199583851.

It can be written as a sum of positive squares in 2 ways, for example, as 154952704 + 52809289 = 12448^2 + 7267^2 .

It is a cyclic number.

It is not a de Polignac number, because 207761993 - 2² = 207761989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (207761999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2807558 + ... + 2807631.

It is an arithmetic number, because the mean of its divisors is an integer number (53344305).

Almost surely, 2^207761993 is an apocalyptic number.

It is an amenable number.

207761993 is a deficient number, since it is larger than the sum of its proper divisors (5615227).

207761993 is an equidigital number, since it uses as much as digits as its factorization.

207761993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5615226.

The product of its (nonzero) digits is 142884, while the sum is 44.

The square root of 207761993 is about 14413.9513319561. The cubic root of 207761993 is about 592.2731355048.

The spelling of 207761993 in words is "two hundred seven million, seven hundred sixty-one thousand, nine hundred ninety-three".