1020661187 has 8 divisors (see below), whose sum is σ = 1256198496. Its totient is φ = 807556032.

The previous prime is 1020661163. The next prime is 1020661193. The reversal of 1020661187 is 7811660201.

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 1020661187 - 2¹⁰ = 1020660163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020661127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5607938 + ... + 5608119.

It is an arithmetic number, because the mean of its divisors is an integer number (157024812).

Almost surely, 2^1020661187 is an apocalyptic number.

1020661187 is a deficient number, since it is larger than the sum of its proper divisors (235537309).

1020661187 is a wasteful number, since it uses less digits than its factorization.

1020661187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11216077.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 1020661187 is about 31947.7884524109. The cubic root of 1020661187 is about 1006.8401677593.

The spelling of 1020661187 in words is "one billion, twenty million, six hundred sixty-one thousand, one hundred eighty-seven".