140581521 has 16 divisors (see below), whose sum is σ = 209048320. Its totient is φ = 93370320.

The previous prime is 140581501. The next prime is 140581523. The reversal of 140581521 is 125185041.

It is not a de Polignac number, because 140581521 - 2⁶ = 140581457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140581523) 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, 2290 + ... + 16923.

It is an arithmetic number, because the mean of its divisors is an integer number (13065520).

Almost surely, 2^140581521 is an apocalyptic number.

It is an amenable number.

140581521 is a deficient number, since it is larger than the sum of its proper divisors (68466799).

140581521 is a wasteful number, since it uses less digits than its factorization.

140581521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19493 (or 19487 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The square root of 140581521 is about 11856.7078483026. The cubic root of 140581521 is about 519.9673561855.

The spelling of 140581521 in words is "one hundred forty million, five hundred eighty-one thousand, five hundred twenty-one".