1631552540 has 24 divisors (see below), whose sum is σ = 3427160352. Its totient is φ = 652449600.

The previous prime is 1631552521. The next prime is 1631552551. The reversal of 1631552540 is 452551361.

It is a junction number, because it is equal to n+sod(n) for n = 1631552497 and 1631552506.

It is a congruent number.

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, 90782 + ... + 107258.

It is an arithmetic number, because the mean of its divisors is an integer number (142798348).

Almost surely, 2^1631552540 is an apocalyptic number.

1631552540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1631552540 is an abundant number, since it is smaller than the sum of its proper divisors (1795607812).

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

1631552540 is a wasteful number, since it uses less digits than its factorization.

1631552540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21437 (or 21435 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 1631552540 is about 40392.4812310410. The cubic root of 1631552540 is about 1177.2454517434.

The spelling of 1631552540 in words is "one billion, six hundred thirty-one million, five hundred fifty-two thousand, five hundred forty".