1451420191 has 4 divisors (see below), whose sum is σ = 1563067912. Its totient is φ = 1339772472.

The previous prime is 1451420183. The next prime is 1451420209. The reversal of 1451420191 is 1910241541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1451420191 - 2³ = 1451420183 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 (1451420141) 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, 55823841 + ... + 55823866.

It is an arithmetic number, because the mean of its divisors is an integer number (390766978).

Almost surely, 2^1451420191 is an apocalyptic number.

1451420191 is a deficient number, since it is larger than the sum of its proper divisors (111647721).

1451420191 is a wasteful number, since it uses less digits than its factorization.

1451420191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111647720.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1451420191 is about 38097.5089868091. The cubic root of 1451420191 is about 1132.2206029440.

The spelling of 1451420191 in words is "one billion, four hundred fifty-one million, four hundred twenty thousand, one hundred ninety-one".