101780725 has 12 divisors (see below), whose sum is σ = 127133604. Its totient is φ = 80827520.

The previous prime is 101780711. The next prime is 101780743. The reversal of 101780725 is 527087101.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 938961 + 100841764 = 969^2 + 10042^2 .

It is not a de Polignac number, because 101780725 - 2²⁵ = 68226293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11434 + ... + 18283.

It is an arithmetic number, because the mean of its divisors is an integer number (10594467).

Almost surely, 2^101780725 is an apocalyptic number.

It is an amenable number.

101780725 is a deficient number, since it is larger than the sum of its proper divisors (25352879).

101780725 is a wasteful number, since it uses less digits than its factorization.

101780725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29864 (or 29859 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 101780725 is about 10088.6433676684. The cubic root of 101780725 is about 466.8978205744.

The spelling of 101780725 in words is "one hundred one million, seven hundred eighty thousand, seven hundred twenty-five".