2113540157 has 4 divisors (see below), whose sum is σ = 2122769820. Its totient is φ = 2104310496.

The previous prime is 2113540129. The next prime is 2113540189. The reversal of 2113540157 is 7510453112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1377448996 + 736091161 = 37114^2 + 27131^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113540157 - 2¹⁰ = 2113539133 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 (2113540057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4614488 + ... + 4614945.

It is an arithmetic number, because the mean of its divisors is an integer number (530692455).

Almost surely, 2^2113540157 is an apocalyptic number.

It is an amenable number.

2113540157 is a deficient number, since it is larger than the sum of its proper divisors (9229663).

2113540157 is an equidigital number, since it uses as much as digits as its factorization.

2113540157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9229662.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 2113540157 is about 45973.2548010253. The cubic root of 2113540157 is about 1283.3255316255.

Adding to 2113540157 its reverse (7510453112), we get a palindrome (9623993269).

The spelling of 2113540157 in words is "two billion, one hundred thirteen million, five hundred forty thousand, one hundred fifty-seven".