101631240 has 128 divisors (see below), whose sum is σ = 341712000. Its totient is φ = 26866944.

The previous prime is 101631223. The next prime is 101631269. The reversal of 101631240 is 42136101.

It is a happy number.

101631240 is a `hidden beast` number, since 10 + 1 + 631 + 24 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149782 + ... + 150458.

It is an arithmetic number, because the mean of its divisors is an integer number (2669625).

Almost surely, 2^101631240 is an apocalyptic number.

101631240 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 101631240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170856000).

101631240 is an abundant number, since it is smaller than the sum of its proper divisors (240080760).

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

101631240 is a wasteful number, since it uses less digits than its factorization.

101631240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836 (or 826 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 101631240 is about 10081.2320675600. The cubic root of 101631240 is about 466.6691315063.

Adding to 101631240 its reverse (42136101), we get a palindrome (143767341).

The spelling of 101631240 in words is "one hundred one million, six hundred thirty-one thousand, two hundred forty".