1261603152 has 30 divisors (see below), whose sum is σ = 3530737002. Its totient is φ = 420534336.

The previous prime is 1261603151. The next prime is 1261603157. The reversal of 1261603152 is 2513061621.

1261603152 is a `hidden beast` number, since 1 + 2 + 6 + 1 + 603 + 1 + 52 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1146770496 + 114832656 = 33864^2 + 10716^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261603151) 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, 4380423 + ... + 4380710.

Almost surely, 2^1261603152 is an apocalyptic number.

1261603152 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1261603152 is an abundant number, since it is smaller than the sum of its proper divisors (2269133850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261603152 is a wasteful number, since it uses less digits than its factorization.

1261603152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8761147 (or 8761138 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1261603152 is about 35519.0533657641. The cubic root of 1261603152 is about 1080.5401824474.

Adding to 1261603152 its reverse (2513061621), we get a palindrome (3774664773).

The spelling of 1261603152 in words is "one billion, two hundred sixty-one million, six hundred three thousand, one hundred fifty-two".