1261052516 has 12 divisors (see below), whose sum is σ = 2237073132. Its totient is φ = 621888768.

The previous prime is 1261052461. The next prime is 1261052557. The reversal of 1261052516 is 6152501621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 726518116 + 534534400 = 26954^2 + 23120^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2159045 + ... + 2159628.

It is an arithmetic number, because the mean of its divisors is an integer number (186422761).

Almost surely, 2^1261052516 is an apocalyptic number.

It is an amenable number.

1261052516 is a deficient number, since it is larger than the sum of its proper divisors (976020616).

1261052516 is a wasteful number, since it uses less digits than its factorization.

1261052516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4318750 (or 4318748 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1261052516 is about 35511.3012434070. The cubic root of 1261052516 is about 1080.3829563271.

The spelling of 1261052516 in words is "one billion, two hundred sixty-one million, fifty-two thousand, five hundred sixteen".