1261335552 has 176 divisors, whose sum is σ = 3508918272. Its totient is φ = 402554880.

The previous prime is 1261335529. The next prime is 1261335563. The reversal of 1261335552 is 2555331621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9931713 + ... + 9931839.

Almost surely, 2^1261335552 is an apocalyptic number.

1261335552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1261335552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1754459136).

1261335552 is an abundant number, since it is smaller than the sum of its proper divisors (2247582720).

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

1261335552 is a wasteful number, since it uses less digits than its factorization.

1261335552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 246 counting only the distinct ones).

The product of its digits is 27000, while the sum is 33.

The square root of 1261335552 is about 35515.2861737027. The cubic root of 1261335552 is about 1080.4637788654.

The spelling of 1261335552 in words is "one billion, two hundred sixty-one million, three hundred thirty-five thousand, five hundred fifty-two".