451661101 has 4 divisors (see below), whose sum is σ = 454432192. Its totient is φ = 448890012.

The previous prime is 451661087. The next prime is 451661123. The reversal of 451661101 is 101166154.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101166154 = 2 ⋅50583077.

It is a cyclic number.

It is not a de Polignac number, because 451661101 - 2⁵ = 451661069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451661201) 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, 1385301 + ... + 1385626.

It is an arithmetic number, because the mean of its divisors is an integer number (113608048).

Almost surely, 2^451661101 is an apocalyptic number.

It is an amenable number.

451661101 is a deficient number, since it is larger than the sum of its proper divisors (2771091).

451661101 is a wasteful number, since it uses less digits than its factorization.

451661101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771090.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 451661101 is about 21252.3198968960. The cubic root of 451661101 is about 767.2511763295.

The spelling of 451661101 in words is "four hundred fifty-one million, six hundred sixty-one thousand, one hundred one".