1240165161 has 20 divisors (see below), whose sum is σ = 1857973392. Its totient is φ = 824375448.

The previous prime is 1240165133. The next prime is 1240165183. The reversal of 1240165161 is 1615610421.

1240165161 is a `hidden beast` number, since 1 + 2 + 4 + 0 + 1 + 651 + 6 + 1 = 666.

It is not a de Polignac number, because 1240165161 - 2⁶ = 1240165097 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1240165361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6046 + ... + 50168.

Almost surely, 2^1240165161 is an apocalyptic number.

It is an amenable number.

1240165161 is a deficient number, since it is larger than the sum of its proper divisors (617808231).

1240165161 is an equidigital number, since it uses as much as digits as its factorization.

1240165161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44482 (or 44473 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1240165161 is about 35215.9787738464. The cubic root of 1240165161 is about 1074.3847674157.

Adding to 1240165161 its reverse (1615610421), we get a palindrome (2855775582).

The spelling of 1240165161 in words is "one billion, two hundred forty million, one hundred sixty-five thousand, one hundred sixty-one".