261922007 has 4 divisors (see below), whose sum is σ = 270371136. Its totient is φ = 253472880.

The previous prime is 261921991. The next prime is 261922039. The reversal of 261922007 is 700229162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261922007 - 2⁴ = 261921991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261922607) 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, 4224518 + ... + 4224579.

It is an arithmetic number, because the mean of its divisors is an integer number (67592784).

Almost surely, 2^261922007 is an apocalyptic number.

261922007 is a deficient number, since it is larger than the sum of its proper divisors (8449129).

261922007 is an equidigital number, since it uses as much as digits as its factorization.

261922007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8449128.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 261922007 is about 16184.0046651007. The cubic root of 261922007 is about 639.8192906141.

The spelling of 261922007 in words is "two hundred sixty-one million, nine hundred twenty-two thousand, seven".