1540145391 has 16 divisors (see below), whose sum is σ = 2093680224. Its totient is φ = 1006713344.

The previous prime is 1540145363. The next prime is 1540145393. The reversal of 1540145391 is 1935410451.

It is a cyclic number.

It is not a de Polignac number, because 1540145391 - 2¹⁴ = 1540129007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540145393) 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, 363115 + ... + 367331.

It is an arithmetic number, because the mean of its divisors is an integer number (130855014).

Almost surely, 2^1540145391 is an apocalyptic number.

1540145391 is a deficient number, since it is larger than the sum of its proper divisors (553534833).

1540145391 is a wasteful number, since it uses less digits than its factorization.

1540145391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6570.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1540145391 is about 39244.6861498471. The cubic root of 1540145391 is about 1154.8366906150.

The spelling of 1540145391 in words is "one billion, five hundred forty million, one hundred forty-five thousand, three hundred ninety-one".