101209861 has 4 divisors (see below), whose sum is σ = 102635424. Its totient is φ = 99784300.

The previous prime is 101209859. The next prime is 101209873. The reversal of 101209861 is 168902101.

It is a happy number.

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 101209861 - 2¹ = 101209859 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 (101209811) 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, 712675 + ... + 712816.

It is an arithmetic number, because the mean of its divisors is an integer number (25658856).

Almost surely, 2^101209861 is an apocalyptic number.

It is an amenable number.

101209861 is a deficient number, since it is larger than the sum of its proper divisors (1425563).

101209861 is an equidigital number, since it uses as much as digits as its factorization.

101209861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425562.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 101209861 is about 10060.3111780899. The cubic root of 101209861 is about 466.0232770336.

The spelling of 101209861 in words is "one hundred one million, two hundred nine thousand, eight hundred sixty-one".