1691228417 has 2 divisors, whose sum is σ = 1691228418. Its totient is φ = 1691228416.

The previous prime is 1691228377. The next prime is 1691228431. The reversal of 1691228417 is 7148221961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1677803521 + 13424896 = 40961^2 + 3664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1691228417 - 2¹⁶ = 1691162881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1691228317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845614208 + 845614209.

It is an arithmetic number, because the mean of its divisors is an integer number (845614209).

Almost surely, 2^1691228417 is an apocalyptic number.

It is an amenable number.

1691228417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691228417 is an equidigital number, since it uses as much as digits as its factorization.

1691228417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 1691228417 is about 41124.5476206122. The cubic root of 1691228417 is about 1191.4269578019.

The spelling of 1691228417 in words is "one billion, six hundred ninety-one million, two hundred twenty-eight thousand, four hundred seventeen".