1261203195 has 16 divisors (see below), whose sum is σ = 2306200320. Its totient is φ = 576549984.

The previous prime is 1261203179. The next prime is 1261203197. The reversal of 1261203195 is 5913021621.

It is not a de Polignac number, because 1261203195 - 2⁴ = 1261203179 is a prime.

It is a super-3 number, since 3×1261203195³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1261203197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6005625 + ... + 6005834.

It is an arithmetic number, because the mean of its divisors is an integer number (144137520).

Almost surely, 2^1261203195 is an apocalyptic number.

1261203195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1261203195 is a deficient number, since it is larger than the sum of its proper divisors (1044997125).

1261203195 is a wasteful number, since it uses less digits than its factorization.

1261203195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12011474.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1261203195 is about 35513.4227440837. The cubic root of 1261203195 is about 1080.4259850771.

The spelling of 1261203195 in words is "one billion, two hundred sixty-one million, two hundred three thousand, one hundred ninety-five".