1005206157 has 6 divisors (see below), whose sum is σ = 1451964462. Its totient is φ = 670137432.

The previous prime is 1005206119. The next prime is 1005206197. The reversal of 1005206157 is 7516025001.

It can be written as a sum of positive squares in only one way, i.e., 888695721 + 116510436 = 29811^2 + 10794^2 .

It is not a de Polignac number, because 1005206157 - 2⁷ = 1005206029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1005206157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005206197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55844778 + ... + 55844795.

It is an arithmetic number, because the mean of its divisors is an integer number (241994077).

Almost surely, 2^1005206157 is an apocalyptic number.

It is an amenable number.

1005206157 is a deficient number, since it is larger than the sum of its proper divisors (446758305).

1005206157 is a wasteful number, since it uses less digits than its factorization.

1005206157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111689579 (or 111689576 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 1005206157 is about 31704.9863113044. The cubic root of 1005206157 is about 1001.7323827835.

The spelling of 1005206157 in words is "one billion, five million, two hundred six thousand, one hundred fifty-seven".