201651540 has 24 divisors (see below), whose sum is σ = 564624480. Its totient is φ = 53773728.

The previous prime is 201651509. The next prime is 201651547. The reversal of 201651540 is 45156102.

It is a self number, because there is not a number n which added to its sum of digits gives 201651540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201651547) 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, 1680370 + ... + 1680489.

It is an arithmetic number, because the mean of its divisors is an integer number (23526020).

Almost surely, 2^201651540 is an apocalyptic number.

201651540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201651540 is an abundant number, since it is smaller than the sum of its proper divisors (362972940).

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

201651540 is a wasteful number, since it uses less digits than its factorization.

201651540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3360871 (or 3360869 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 201651540 is about 14200.4063322146. The cubic root of 201651540 is about 586.4088477739.

The spelling of 201651540 in words is "two hundred one million, six hundred fifty-one thousand, five hundred forty".