101561403 has 8 divisors (see below), whose sum is σ = 142542400. Its totient is φ = 64144008.

The previous prime is 101561381. The next prime is 101561423. The reversal of 101561403 is 304165101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 101561403 - 2⁸ = 101561147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101561403.

It is not an unprimeable number, because it can be changed into a prime (101561423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 890833 + ... + 890946.

It is an arithmetic number, because the mean of its divisors is an integer number (17817800).

Almost surely, 2^101561403 is an apocalyptic number.

101561403 is a deficient number, since it is larger than the sum of its proper divisors (40980997).

101561403 is a wasteful number, since it uses less digits than its factorization.

101561403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781801.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 101561403 is about 10077.7677587847. The cubic root of 101561403 is about 466.5622147747.

The spelling of 101561403 in words is "one hundred one million, five hundred sixty-one thousand, four hundred three".