262921261 has 4 divisors (see below), whose sum is σ = 271402624. Its totient is φ = 254439900.

The previous prime is 262921249. The next prime is 262921277. The reversal of 262921261 is 162129262.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-262921261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 8481331 = 262921261 / (2 + 6 + 2 + 9 + 2 + 1 + 2 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (262921231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4240635 + ... + 4240696.

It is an arithmetic number, because the mean of its divisors is an integer number (67850656).

Almost surely, 2^262921261 is an apocalyptic number.

262921261 is the 7252-nd centered decagonal number.

It is an amenable number.

262921261 is a deficient number, since it is larger than the sum of its proper divisors (8481363).

262921261 is an equidigital number, since it uses as much as digits as its factorization.

262921261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8481362.

The product of its digits is 5184, while the sum is 31.

The square root of 262921261 is about 16214.8469311307. The cubic root of 262921261 is about 640.6319124886.

The spelling of 262921261 in words is "two hundred sixty-two million, nine hundred twenty-one thousand, two hundred sixty-one".