101989541 has 4 divisors (see below), whose sum is σ = 103386732. Its totient is φ = 100592352.

The previous prime is 101989529. The next prime is 101989561. The reversal of 101989541 is 145989101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33016516 + 68973025 = 5746^2 + 8305^2 .

It is a cyclic number.

It is not a de Polignac number, because 101989541 - 2¹⁸ = 101727397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101989495 and 101989504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101989561) 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, 698486 + ... + 698631.

It is an arithmetic number, because the mean of its divisors is an integer number (25846683).

Almost surely, 2^101989541 is an apocalyptic number.

It is an amenable number.

101989541 is a deficient number, since it is larger than the sum of its proper divisors (1397191).

101989541 is an equidigital number, since it uses as much as digits as its factorization.

101989541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397190.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 101989541 is about 10098.9871274302. The cubic root of 101989541 is about 467.2169023922.

The spelling of 101989541 in words is "one hundred one million, nine hundred eighty-nine thousand, five hundred forty-one".