261371377 has 4 divisors (see below), whose sum is σ = 265052736. Its totient is φ = 257690020.

The previous prime is 261371347. The next prime is 261371389. The reversal of 261371377 is 773173162.

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 not a de Polignac number, because 261371377 - 2¹⁹ = 260847089 is a prime.

It is a super-2 number, since 2×261371377² = 136629993429752258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261371347) 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, 1840573 + ... + 1840714.

It is an arithmetic number, because the mean of its divisors is an integer number (66263184).

Almost surely, 2^261371377 is an apocalyptic number.

It is an amenable number.

261371377 is a deficient number, since it is larger than the sum of its proper divisors (3681359).

261371377 is an equidigital number, since it uses as much as digits as its factorization.

261371377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681358.

The product of its digits is 37044, while the sum is 37.

The square root of 261371377 is about 16166.9841652672. The cubic root of 261371377 is about 639.3706190578.

The spelling of 261371377 in words is "two hundred sixty-one million, three hundred seventy-one thousand, three hundred seventy-seven".