1257136205 has 16 divisors (see below), whose sum is σ = 1625352960. Its totient is φ = 927920448.

The previous prime is 1257136201. The next prime is 1257136217. The reversal of 1257136205 is 5026317521.

It is not a de Polignac number, because 1257136205 - 2² = 1257136201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257136201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245966 + ... + 251024.

It is an arithmetic number, because the mean of its divisors is an integer number (101584560).

Almost surely, 2^1257136205 is an apocalyptic number.

It is an amenable number.

1257136205 is a deficient number, since it is larger than the sum of its proper divisors (368216755).

1257136205 is a wasteful number, since it uses less digits than its factorization.

1257136205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8900.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 1257136205 is about 35456.1166091268. The cubic root of 1257136205 is about 1079.2633880272.

The spelling of 1257136205 in words is "one billion, two hundred fifty-seven million, one hundred thirty-six thousand, two hundred five".