761340221 has 2 divisors, whose sum is σ = 761340222. Its totient is φ = 761340220.

The previous prime is 761340199. The next prime is 761340233. The reversal of 761340221 is 122043167.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 457360996 + 303979225 = 21386^2 + 17435^2 .

It is an emirp because it is prime and its reverse (122043167) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 761340221 - 2¹⁴ = 761323837 is a prime.

It is a super-2 number, since 2×761340221² = 1159277864224657682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (761340721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380670110 + 380670111.

It is an arithmetic number, because the mean of its divisors is an integer number (380670111).

Almost surely, 2^761340221 is an apocalyptic number.

It is an amenable number.

761340221 is a deficient number, since it is larger than the sum of its proper divisors (1).

761340221 is an equidigital number, since it uses as much as digits as its factorization.

761340221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 761340221 is about 27592.3942600130. The cubic root of 761340221 is about 913.1166417071.

Adding to 761340221 its reverse (122043167), we get a palindrome (883383388).

The spelling of 761340221 in words is "seven hundred sixty-one million, three hundred forty thousand, two hundred twenty-one".