101561440 has 24 divisors (see below), whose sum is σ = 239939280. Its totient is φ = 40624512.

The previous prime is 101561431. The next prime is 101561477. The reversal of 101561440 is 44165101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317220 + ... + 317539.

It is an arithmetic number, because the mean of its divisors is an integer number (9997470).

Almost surely, 2^101561440 is an apocalyptic number.

101561440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101561440 is an abundant number, since it is smaller than the sum of its proper divisors (138377840).

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

101561440 is an equidigital number, since it uses as much as digits as its factorization.

101561440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634774 (or 634766 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 101561440 is about 10077.7695945085. The cubic root of 101561440 is about 466.5622714327.

The spelling of 101561440 in words is "one hundred one million, five hundred sixty-one thousand, four hundred forty".