101780453 has 4 divisors (see below), whose sum is σ = 101801868. Its totient is φ = 101759040.

The previous prime is 101780447. The next prime is 101780461. The reversal of 101780453 is 354087101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 354087101 = 17 ⋅20828653.

It can be written as a sum of positive squares in 2 ways, for example, as 1119364 + 100661089 = 1058^2 + 10033^2 .

It is a cyclic number.

It is not a de Polignac number, because 101780453 - 2⁶ = 101780389 is a prime.

It is a super-2 number, since 2×101780453² = 20718521225770418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101780423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26 + ... + 14267.

It is an arithmetic number, because the mean of its divisors is an integer number (25450467).

Almost surely, 2^101780453 is an apocalyptic number.

It is an amenable number.

101780453 is a deficient number, since it is larger than the sum of its proper divisors (21415).

101780453 is an equidigital number, since it uses as much as digits as its factorization.

101780453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21414.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 101780453 is about 10088.6298871551. The cubic root of 101780453 is about 466.8974046596.

The spelling of 101780453 in words is "one hundred one million, seven hundred eighty thousand, four hundred fifty-three".