1261330552 has 32 divisors (see below), whose sum is σ = 2391120000. Its totient is φ = 623719264.

The previous prime is 1261330547. The next prime is 1261330559. The reversal of 1261330552 is 2550331621.

It is a super-2 number, since 2×1261330552² = 3181909522817249408, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1261330552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261330559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840699 + ... + 842197.

It is an arithmetic number, because the mean of its divisors is an integer number (74722500).

Almost surely, 2^1261330552 is an apocalyptic number.

It is an amenable number.

1261330552 is a deficient number, since it is larger than the sum of its proper divisors (1129789448).

1261330552 is a wasteful number, since it uses less digits than its factorization.

1261330552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595 (or 2591 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 1261330552 is about 35515.2157814084. The cubic root of 1261330552 is about 1080.4623511919.

The spelling of 1261330552 in words is "one billion, two hundred sixty-one million, three hundred thirty thousand, five hundred fifty-two".