1261069487 has 8 divisors (see below), whose sum is σ = 1278368256. Its totient is φ = 1243886112.

The previous prime is 1261069477. The next prime is 1261069489. The reversal of 1261069487 is 7849601621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1261069487 - 2⁶ = 1261069423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261069489) 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, 6728 + ... + 50669.

It is an arithmetic number, because the mean of its divisors is an integer number (159796032).

Almost surely, 2^1261069487 is an apocalyptic number.

1261069487 is a deficient number, since it is larger than the sum of its proper divisors (17298769).

1261069487 is a wasteful number, since it uses less digits than its factorization.

1261069487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57697.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 1261069487 is about 35511.5401947029. The cubic root of 1261069487 is about 1080.3878028334.

The spelling of 1261069487 in words is "one billion, two hundred sixty-one million, sixty-nine thousand, four hundred eighty-seven".