920143661 has 4 divisors (see below), whose sum is σ = 923809824. Its totient is φ = 916477500.

The previous prime is 920143603. The next prime is 920143669. The reversal of 920143661 is 166341029.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 920143661 - 2⁶ = 920143597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920143669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1832705 + ... + 1833206.

It is an arithmetic number, because the mean of its divisors is an integer number (230952456).

Almost surely, 2^920143661 is an apocalyptic number.

It is an amenable number.

920143661 is a deficient number, since it is larger than the sum of its proper divisors (3666163).

920143661 is a wasteful number, since it uses less digits than its factorization.

920143661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666162.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 920143661 is about 30333.8698652183. The cubic root of 920143661 is about 972.6394478896.

The spelling of 920143661 in words is "nine hundred twenty million, one hundred forty-three thousand, six hundred sixty-one".