1691708461 has 2 divisors, whose sum is σ = 1691708462. Its totient is φ = 1691708460.

The previous prime is 1691708419. The next prime is 1691708467. The reversal of 1691708461 is 1648071961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1484175625 + 207532836 = 38525^2 + 14406^2 .

It is a cyclic number.

It is not a de Polignac number, because 1691708461 - 2⁹ = 1691707949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691708467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845854230 + 845854231.

It is an arithmetic number, because the mean of its divisors is an integer number (845854231).

Almost surely, 2^1691708461 is an apocalyptic number.

It is an amenable number.

1691708461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691708461 is an equidigital number, since it uses as much as digits as its factorization.

1691708461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1691708461 is about 41130.3836719280. The cubic root of 1691708461 is about 1191.5396733586.

The spelling of 1691708461 in words is "one billion, six hundred ninety-one million, seven hundred eight thousand, four hundred sixty-one".