261145401 has 16 divisors (see below), whose sum is σ = 382844928. Its totient is φ = 157021200.

The previous prime is 261145393. The next prime is 261145421. The reversal of 261145401 is 104541162.

It is a happy number.

261145401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261145401 - 2³ = 261145393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261145421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26965 + ... + 35346.

It is an arithmetic number, because the mean of its divisors is an integer number (23927808).

Almost surely, 2^261145401 is an apocalyptic number.

It is an amenable number.

261145401 is a deficient number, since it is larger than the sum of its proper divisors (121699527).

261145401 is a wasteful number, since it uses less digits than its factorization.

261145401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62452.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 261145401 is about 16159.9938428206. The cubic root of 261145401 is about 639.1863039586.

Adding to 261145401 its reverse (104541162), we get a palindrome (365686563).

The spelling of 261145401 in words is "two hundred sixty-one million, one hundred forty-five thousand, four hundred one".