261520422 has 16 divisors (see below), whose sum is σ = 523402560. Its totient is φ = 87113192.

The previous prime is 261520387. The next prime is 261520423. The reversal of 261520422 is 224025162.

It is a happy number.

It is a super-2 number, since 2×261520422² = 136785862246116168, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261520392 and 261520401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261520423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5172 + ... + 23447.

It is an arithmetic number, because the mean of its divisors is an integer number (32712660).

Almost surely, 2^261520422 is an apocalyptic number.

261520422 is an abundant number, since it is smaller than the sum of its proper divisors (261882138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261520422 is a wasteful number, since it uses less digits than its factorization.

261520422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30147.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 261520422 is about 16171.5930569626. The cubic root of 261520422 is about 639.4921280093.

Adding to 261520422 its reverse (224025162), we get a palindrome (485545584).

The spelling of 261520422 in words is "two hundred sixty-one million, five hundred twenty thousand, four hundred twenty-two".