1015211138 has 4 divisors (see below), whose sum is σ = 1522816710. Its totient is φ = 507605568.

The previous prime is 1015211137. The next prime is 1015211147. The reversal of 1015211138 is 8311125101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8311125101 = 7877 ⋅1055113.

It can be written as a sum of positive squares in only one way, i.e., 1014613609 + 597529 = 31853^2 + 773^2 .

It is not an unprimeable number, because it can be changed into a prime (1015211137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253802783 + ... + 253802786.

Almost surely, 2^1015211138 is an apocalyptic number.

1015211138 is a deficient number, since it is larger than the sum of its proper divisors (507605572).

1015211138 is an equidigital number, since it uses as much as digits as its factorization.

1015211138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507605571.

The product of its (nonzero) digits is 240, while the sum is 23.

The square root of 1015211138 is about 31862.3780970599. The cubic root of 1015211138 is about 1005.0448856631.

Adding to 1015211138 its reverse (8311125101), we get a palindrome (9326336239).

The spelling of 1015211138 in words is "one billion, fifteen million, two hundred eleven thousand, one hundred thirty-eight".