1421725191 has 4 divisors (see below), whose sum is σ = 1895633592. Its totient is φ = 947816792.

The previous prime is 1421725133. The next prime is 1421725237. The reversal of 1421725191 is 1915271241.

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 1421725191 - 2¹¹ = 1421723143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421725121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236954196 + ... + 236954201.

It is an arithmetic number, because the mean of its divisors is an integer number (473908398).

Almost surely, 2^1421725191 is an apocalyptic number.

1421725191 is a deficient number, since it is larger than the sum of its proper divisors (473908401).

1421725191 is an equidigital number, since it uses as much as digits as its factorization.

1421725191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473908400.

The product of its digits is 5040, while the sum is 33.

The square root of 1421725191 is about 37705.7713221729. The cubic root of 1421725191 is about 1124.4458679400.

The spelling of 1421725191 in words is "one billion, four hundred twenty-one million, seven hundred twenty-five thousand, one hundred ninety-one".