261994707 has 24 divisors (see below), whose sum is σ = 411601008. Its totient is φ = 159624000.

The previous prime is 261994699. The next prime is 261994717. The reversal of 261994707 is 707499162.

It is not a de Polignac number, because 261994707 - 2³ = 261994699 is a prime.

It is a super-3 number, since 3×261994707³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (261994717) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 732 + ... + 22902.

It is an arithmetic number, because the mean of its divisors is an integer number (17150042).

Almost surely, 2^261994707 is an apocalyptic number.

261994707 is a deficient number, since it is larger than the sum of its proper divisors (149606301).

261994707 is a wasteful number, since it uses less digits than its factorization.

261994707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22291 (or 22288 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 261994707 is about 16186.2505540968. The cubic root of 261994707 is about 639.8784819742.

The spelling of 261994707 in words is "two hundred sixty-one million, nine hundred ninety-four thousand, seven hundred seven".