202156989 has 8 divisors (see below), whose sum is σ = 273961632. Its totient is φ = 132561840.

The previous prime is 202156987. The next prime is 202156991. The reversal of 202156989 is 989651202.

It is an interprime number because it is at equal distance from previous prime (202156987) and next prime (202156991).

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

It is not a de Polignac number, because 202156989 - 2¹ = 202156987 is a prime.

It is a super-2 number, since 2×202156989² = 81734896403092242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 202156989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202156987) 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, 552159 + ... + 552524.

It is an arithmetic number, because the mean of its divisors is an integer number (34245204).

Almost surely, 2^202156989 is an apocalyptic number.

It is an amenable number.

202156989 is a deficient number, since it is larger than the sum of its proper divisors (71804643).

202156989 is a wasteful number, since it uses less digits than its factorization.

202156989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104747.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 202156989 is about 14218.1921846626. The cubic root of 202156989 is about 586.8983926977.

The spelling of 202156989 in words is "two hundred two million, one hundred fifty-six thousand, nine hundred eighty-nine".