1451919491 has 4 divisors (see below), whose sum is σ = 1583912184. Its totient is φ = 1319926800.

The previous prime is 1451919461. The next prime is 1451919509. The reversal of 1451919491 is 1949191541.

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 1451919491 - 2¹⁰ = 1451918467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1451919401) 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, 65996330 + ... + 65996351.

It is an arithmetic number, because the mean of its divisors is an integer number (395978046).

Almost surely, 2^1451919491 is an apocalyptic number.

1451919491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1451919491 is a deficient number, since it is larger than the sum of its proper divisors (131992693).

1451919491 is a wasteful number, since it uses less digits than its factorization.

1451919491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131992692.

The product of its digits is 58320, while the sum is 44.

The square root of 1451919491 is about 38104.0613452162. The cubic root of 1451919491 is about 1132.3504190001.

The spelling of 1451919491 in words is "one billion, four hundred fifty-one million, nine hundred nineteen thousand, four hundred ninety-one".