1531713820 has 48 divisors (see below), whose sum is σ = 3958895808. Its totient is φ = 484761600.

The previous prime is 1531713797. The next prime is 1531713829. The reversal of 1531713820 is 283171351.

It is a super-2 number, since 2×1531713820² = 4692294452757984800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531713829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 418981 + ... + 422620.

It is an arithmetic number, because the mean of its divisors is an integer number (82476996).

Almost surely, 2^1531713820 is an apocalyptic number.

1531713820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1531713820 is an abundant number, since it is smaller than the sum of its proper divisors (2427181988).

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

1531713820 is a wasteful number, since it uses less digits than its factorization.

1531713820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841630 (or 841628 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1531713820 is about 39137.1156320953. The cubic root of 1531713820 is about 1152.7254374602.

The spelling of 1531713820 in words is "one billion, five hundred thirty-one million, seven hundred thirteen thousand, eight hundred twenty".