2157074761 has 4 divisors (see below), whose sum is σ = 2157731524. Its totient is φ = 2156418000.

The previous prime is 2157074749. The next prime is 2157074771. The reversal of 2157074761 is 1674707512.

It is a happy number.

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 186158736 + 1970916025 = 13644^2 + 44395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2157074761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157074701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323430 + ... + 330031.

It is an arithmetic number, because the mean of its divisors is an integer number (539432881).

Almost surely, 2^2157074761 is an apocalyptic number.

It is an amenable number.

2157074761 is a deficient number, since it is larger than the sum of its proper divisors (656763).

2157074761 is an equidigital number, since it uses as much as digits as its factorization.

2157074761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656762.

The product of its (nonzero) digits is 82320, while the sum is 40.

The square root of 2157074761 is about 46444.3189313828. The cubic root of 2157074761 is about 1292.0770099902.

The spelling of 2157074761 in words is "two billion, one hundred fifty-seven million, seventy-four thousand, seven hundred sixty-one".