190640069 has 2 divisors, whose sum is σ = 190640070. Its totient is φ = 190640068.

The previous prime is 190640063. The next prime is 190640083. The reversal of 190640069 is 960046091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162231169 + 28408900 = 12737^2 + 5330^2 .

It is an emirp because it is prime and its reverse (960046091) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190640069 is a prime.

It is a super-2 number, since 2×190640069² = 72687271816649522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190640063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95320034 + 95320035.

It is an arithmetic number, because the mean of its divisors is an integer number (95320035).

Almost surely, 2^190640069 is an apocalyptic number.

It is an amenable number.

190640069 is a deficient number, since it is larger than the sum of its proper divisors (1).

190640069 is an equidigital number, since it uses as much as digits as its factorization.

190640069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 190640069 is about 13807.2469739626. The cubic root of 190640069 is about 575.5345441212.

The spelling of 190640069 in words is "one hundred ninety million, six hundred forty thousand, sixty-nine".