4181561157 has 8 divisors (see below), whose sum is σ = 5576200960. Its totient is φ = 2787314400.

The previous prime is 4181561149. The next prime is 4181561191. The reversal of 4181561157 is 7511651814.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4181561157 - 2³ = 4181561149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4181561957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72469 + ... + 116682.

It is an arithmetic number, because the mean of its divisors is an integer number (697025120).

Almost surely, 2^4181561157 is an apocalyptic number.

It is an amenable number.

4181561157 is a deficient number, since it is larger than the sum of its proper divisors (1394639803).

4181561157 is a wasteful number, since it uses less digits than its factorization.

4181561157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196523.

The product of its digits is 33600, while the sum is 39.

The square root of 4181561157 is about 64664.9917420547. The cubic root of 4181561157 is about 1611.0640904854.

The spelling of 4181561157 in words is "four billion, one hundred eighty-one million, five hundred sixty-one thousand, one hundred fifty-seven".