100449551 has 4 divisors (see below), whose sum is σ = 100536504. Its totient is φ = 100362600.

The previous prime is 100449539. The next prime is 100449571. The reversal of 100449551 is 155944001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155944001 = 19 ⋅8207579.

It is a cyclic number.

It is not a de Polignac number, because 100449551 - 2¹⁴ = 100433167 is a prime.

It is a super-2 number, since 2×100449551² = 20180224592203202, 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 (100449571) 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, 41720 + ... + 44061.

It is an arithmetic number, because the mean of its divisors is an integer number (25134126).

Almost surely, 2^100449551 is an apocalyptic number.

100449551 is a deficient number, since it is larger than the sum of its proper divisors (86953).

100449551 is an equidigital number, since it uses as much as digits as its factorization.

100449551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86952.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 100449551 is about 10022.4523446111. The cubic root of 100449551 is about 464.8533873160.

The spelling of 100449551 in words is "one hundred million, four hundred forty-nine thousand, five hundred fifty-one".