100431545 has 4 divisors (see below), whose sum is σ = 120517860. Its totient is φ = 80345232.

The previous prime is 100431533. The next prime is 100431557. The reversal of 100431545 is 545134001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545134001 = 5167 ⋅105503.

It is an interprime number because it is at equal distance from previous prime (100431533) and next prime (100431557).

It can be written as a sum of positive squares in 2 ways, for example, as 53042089 + 47389456 = 7283^2 + 6884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100431545 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100431545.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10043150 + ... + 10043159.

It is an arithmetic number, because the mean of its divisors is an integer number (30129465).

Almost surely, 2^100431545 is an apocalyptic number.

It is an amenable number.

100431545 is a deficient number, since it is larger than the sum of its proper divisors (20086315).

100431545 is an equidigital number, since it uses as much as digits as its factorization.

100431545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20086314.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 100431545 is about 10021.5540212085. The cubic root of 100431545 is about 464.8256100216.

Adding to 100431545 its reverse (545134001), we get a palindrome (645565546).

The spelling of 100431545 in words is "one hundred million, four hundred thirty-one thousand, five hundred forty-five".