2171512457 has 4 divisors (see below), whose sum is σ = 2171677440. Its totient is φ = 2171347476.

The previous prime is 2171512439. The next prime is 2171512507. The reversal of 2171512457 is 7542151712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2171512457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171512657) 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, 60857 + ... + 89702.

It is an arithmetic number, because the mean of its divisors is an integer number (542919360).

Almost surely, 2^2171512457 is an apocalyptic number.

It is an amenable number.

2171512457 is a deficient number, since it is larger than the sum of its proper divisors (164983).

2171512457 is a wasteful number, since it uses less digits than its factorization.

2171512457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164982.

The product of its digits is 19600, while the sum is 35.

The square root of 2171512457 is about 46599.4898791822. The cubic root of 2171512457 is about 1294.9533049158.

The spelling of 2171512457 in words is "two billion, one hundred seventy-one million, five hundred twelve thousand, four hundred fifty-seven".