1021889677 has 4 divisors (see below), whose sum is σ = 1031811040. Its totient is φ = 1011968316.

The previous prime is 1021889663. The next prime is 1021889689. The reversal of 1021889677 is 7769881201.

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 1021889677 - 2¹⁵ = 1021856909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021889677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021889647) 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, 4960527 + ... + 4960732.

It is an arithmetic number, because the mean of its divisors is an integer number (257952760).

Almost surely, 2^1021889677 is an apocalyptic number.

It is an amenable number.

1021889677 is a deficient number, since it is larger than the sum of its proper divisors (9921363).

1021889677 is an equidigital number, since it uses as much as digits as its factorization.

1021889677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9921362.

The product of its (nonzero) digits is 338688, while the sum is 49.

The square root of 1021889677 is about 31967.0091969831. The cubic root of 1021889677 is about 1007.2439573729.

The spelling of 1021889677 in words is "one billion, twenty-one million, eight hundred eighty-nine thousand, six hundred seventy-seven".