1690005391 has 2 divisors, whose sum is σ = 1690005392. Its totient is φ = 1690005390.

The previous prime is 1690005349. The next prime is 1690005437. The reversal of 1690005391 is 1935000961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1690005391 - 2¹⁵ = 1689972623 is a prime.

It is a super-2 number, since 2×1690005391² = 5712236443218125762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1690005301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845002695 + 845002696.

It is an arithmetic number, because the mean of its divisors is an integer number (845002696).

Almost surely, 2^1690005391 is an apocalyptic number.

1690005391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690005391 is an equidigital number, since it uses as much as digits as its factorization.

1690005391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 1690005391 is about 41109.6751507477. The cubic root of 1690005391 is about 1191.1396917488.

The spelling of 1690005391 in words is "one billion, six hundred ninety million, five thousand, three hundred ninety-one".