101001040 has 160 divisors (see below), whose sum is σ = 283481856. Its totient is φ = 32747520.

The previous prime is 101001037. The next prime is 101001041. The reversal of 101001040 is 40100101.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101001041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1216839 + ... + 1216921.

Almost surely, 2^101001040 is an apocalyptic number.

101001040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 101001040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141740928).

101001040 is an abundant number, since it is smaller than the sum of its proper divisors (182480816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101001040 is a wasteful number, since it uses less digits than its factorization.

101001040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 101001040 is about 10049.9273629216. The cubic root of 101001040 is about 465.7025492204.

Adding to 101001040 its reverse (40100101), we get a palindrome (141101141).

The spelling of 101001040 in words is "one hundred one million, one thousand, forty".