1531534540 has 24 divisors (see below), whose sum is σ = 3319972992. Its totient is φ = 592851840.

The previous prime is 1531534523. The next prime is 1531534583. The reversal of 1531534540 is 454351351.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1234489 + ... + 1235728.

It is an arithmetic number, because the mean of its divisors is an integer number (138332208).

Almost surely, 2^1531534540 is an apocalyptic number.

1531534540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1531534540 is an abundant number, since it is smaller than the sum of its proper divisors (1788438452).

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

1531534540 is a wasteful number, since it uses less digits than its factorization.

1531534540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470257 (or 2470255 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 1531534540 is about 39134.8251561189. The cubic root of 1531534540 is about 1152.6804619830.

Adding to 1531534540 its reverse (454351351), we get a palindrome (1985885891).

The spelling of 1531534540 in words is "one billion, five hundred thirty-one million, five hundred thirty-four thousand, five hundred forty".