1301261565 has 32 divisors (see below), whose sum is σ = 2126290176. Its totient is φ = 679311360.

The previous prime is 1301261543. The next prime is 1301261587. The reversal of 1301261565 is 5651621031.

It is an interprime number because it is at equal distance from previous prime (1301261543) and next prime (1301261587).

It is not a de Polignac number, because 1301261565 - 2²¹ = 1299164413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 385485 + ... + 388845.

It is an arithmetic number, because the mean of its divisors is an integer number (66446568).

Almost surely, 2^1301261565 is an apocalyptic number.

1301261565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1301261565 is a deficient number, since it is larger than the sum of its proper divisors (825028611).

1301261565 is a wasteful number, since it uses less digits than its factorization.

1301261565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3909.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1301261565 is about 36073.0032711445. The cubic root of 1301261565 is about 1091.7458107322.

Adding to 1301261565 its reverse (5651621031), we get a palindrome (6952882596).

The spelling of 1301261565 in words is "one billion, three hundred one million, two hundred sixty-one thousand, five hundred sixty-five".