201515540 has 48 divisors (see below), whose sum is σ = 434367360. Its totient is φ = 78499200.

The previous prime is 201515453. The next prime is 201515549. The reversal of 201515540 is 45515102.

It is a happy number.

It is a super-2 number, since 2×201515540² = 81217025722983200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201515549) 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, 159431 + ... + 160689.

It is an arithmetic number, because the mean of its divisors is an integer number (9049320).

Almost surely, 2^201515540 is an apocalyptic number.

201515540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201515540 is an abundant number, since it is smaller than the sum of its proper divisors (232851820).

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

201515540 is a wasteful number, since it uses less digits than its factorization.

201515540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472 (or 1470 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 201515540 is about 14195.6169291792. The cubic root of 201515540 is about 586.2769874056.

The spelling of 201515540 in words is "two hundred one million, five hundred fifteen thousand, five hundred forty".