261211927 has 2 divisors, whose sum is σ = 261211928. Its totient is φ = 261211926.

The previous prime is 261211891. The next prime is 261211933. The reversal of 261211927 is 729112162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261211927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261211127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130605963 + 130605964.

It is an arithmetic number, because the mean of its divisors is an integer number (130605964).

Almost surely, 2^261211927 is an apocalyptic number.

261211927 is a deficient number, since it is larger than the sum of its proper divisors (1).

261211927 is an equidigital number, since it uses as much as digits as its factorization.

261211927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 261211927 is about 16162.0520664921. The cubic root of 261211927 is about 639.2405762753.

The spelling of 261211927 in words is "two hundred sixty-one million, two hundred eleven thousand, nine hundred twenty-seven".