1771990141 has 8 divisors (see below), whose sum is σ = 1868577120. Its totient is φ = 1675735632.

The previous prime is 1771990123. The next prime is 1771990151. The reversal of 1771990141 is 1410991771.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1771990141 - 2¹¹ = 1771988093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1771990094 and 1771990103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1771990151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72130 + ... + 93523.

It is an arithmetic number, because the mean of its divisors is an integer number (233572140).

Almost surely, 2^1771990141 is an apocalyptic number.

It is an amenable number.

1771990141 is a deficient number, since it is larger than the sum of its proper divisors (96586979).

1771990141 is a wasteful number, since it uses less digits than its factorization.

1771990141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166235.

The product of its (nonzero) digits is 15876, while the sum is 40.

The square root of 1771990141 is about 42095.0132557290. The cubic root of 1771990141 is about 1210.0976951377.

The spelling of 1771990141 in words is "one billion, seven hundred seventy-one million, nine hundred ninety thousand, one hundred forty-one".