1425491781 has 24 divisors (see below), whose sum is σ = 2287213920. Its totient is φ = 786475872.

The previous prime is 1425491773. The next prime is 1425491783. The reversal of 1425491781 is 1871945241.

It is not a de Polignac number, because 1425491781 - 2³ = 1425491773 is a prime.

It is a super-2 number, since 2×1425491781² = 4064053635397103922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1425491783) 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 23 ways as a sum of consecutive naturals, for example, 162931 + ... + 171456.

It is an arithmetic number, because the mean of its divisors is an integer number (95300580).

Almost surely, 2^1425491781 is an apocalyptic number.

It is an amenable number.

1425491781 is a deficient number, since it is larger than the sum of its proper divisors (861722139).

1425491781 is a wasteful number, since it uses less digits than its factorization.

1425491781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334433 (or 334426 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 1425491781 is about 37755.6854129282. The cubic root of 1425491781 is about 1125.4379939978.

The spelling of 1425491781 in words is "one billion, four hundred twenty-five million, four hundred ninety-one thousand, seven hundred eighty-one".