1531689420 has 24 divisors (see below), whose sum is σ = 4288730544. Its totient is φ = 408450496.

The previous prime is 1531689391. The next prime is 1531689421. The reversal of 1531689420 is 249861351.

1531689420 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1531689421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12764019 + ... + 12764138.

It is an arithmetic number, because the mean of its divisors is an integer number (178697106).

Almost surely, 2^1531689420 is an apocalyptic number.

1531689420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1531689420 is an abundant number, since it is smaller than the sum of its proper divisors (2757041124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1531689420 is a wasteful number, since it uses less digits than its factorization.

1531689420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25528169 (or 25528167 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 1531689420 is about 39136.8039062977. The cubic root of 1531689420 is about 1152.7193165060.

The spelling of 1531689420 in words is "one billion, five hundred thirty-one million, six hundred eighty-nine thousand, four hundred twenty".