1261001015 has 8 divisors (see below), whose sum is σ = 1548392208. Its totient is φ = 985340160.

The previous prime is 1261001009. The next prime is 1261001029. The reversal of 1261001015 is 5101001621.

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

It is not a de Polignac number, because 1261001015 - 2¹⁴ = 1260984631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1261000984 and 1261001002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2932346 + ... + 2932775.

It is an arithmetic number, because the mean of its divisors is an integer number (193549026).

Almost surely, 2^1261001015 is an apocalyptic number.

1261001015 is a deficient number, since it is larger than the sum of its proper divisors (287391193).

1261001015 is an equidigital number, since it uses as much as digits as its factorization.

1261001015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5865169.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1261001015 is about 35510.5761006492. The cubic root of 1261001015 is about 1080.3682486235.

Adding to 1261001015 its reverse (5101001621), we get a palindrome (6362002636).

The spelling of 1261001015 in words is "one billion, two hundred sixty-one million, one thousand, fifteen".