261337801 has 4 divisors (see below), whose sum is σ = 261370900. Its totient is φ = 261304704.

The previous prime is 261337793. The next prime is 261337823. The reversal of 261337801 is 108733162.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 42889401 + 218448400 = 6549^2 + 14780^2 .

It is a cyclic number.

It is not a de Polignac number, because 261337801 - 2³ = 261337793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261337841) 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, 2965 + ... + 23053.

It is an arithmetic number, because the mean of its divisors is an integer number (65342725).

Almost surely, 2^261337801 is an apocalyptic number.

It is an amenable number.

261337801 is a deficient number, since it is larger than the sum of its proper divisors (33099).

261337801 is a wasteful number, since it uses less digits than its factorization.

261337801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33098.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 261337801 is about 16165.9457193200. The cubic root of 261337801 is about 639.3432398455.

The spelling of 261337801 in words is "two hundred sixty-one million, three hundred thirty-seven thousand, eight hundred one".