2571887138 has 4 divisors (see below), whose sum is σ = 3857830710. Its totient is φ = 1285943568.

The previous prime is 2571887137. The next prime is 2571887159. The reversal of 2571887138 is 8317881752.

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

It can be written as a sum of positive squares in only one way, i.e., 1290461929 + 1281425209 = 35923^2 + 35797^2 .

It is a super-2 number, since 2×2571887138² = 13229206901219662088, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2571887137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642971783 + ... + 642971786.

Almost surely, 2^2571887138 is an apocalyptic number.

2571887138 is a deficient number, since it is larger than the sum of its proper divisors (1285943572).

2571887138 is a wasteful number, since it uses less digits than its factorization.

2571887138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285943571.

The product of its digits is 752640, while the sum is 50.

The square root of 2571887138 is about 50713.7766095171. The cubic root of 2571887138 is about 1370.0948551724.

The spelling of 2571887138 in words is "two billion, five hundred seventy-one million, eight hundred eighty-seven thousand, one hundred thirty-eight".