261401415 has 32 divisors (see below), whose sum is σ = 457906176. Its totient is φ = 126284160.

The previous prime is 261401407. The next prime is 261401419. The reversal of 261401415 is 514104162.

It is a happy number.

It is not a de Polignac number, because 261401415 - 2³ = 261401407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261401419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45642 + ... + 51048.

It is an arithmetic number, because the mean of its divisors is an integer number (14309568).

Almost surely, 2^261401415 is an apocalyptic number.

261401415 is a deficient number, since it is larger than the sum of its proper divisors (196504761).

261401415 is a wasteful number, since it uses less digits than its factorization.

261401415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5719.

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

The square root of 261401415 is about 16167.9131306424. The cubic root of 261401415 is about 639.3951112563.

Adding to 261401415 its reverse (514104162), we get a palindrome (775505577).

The spelling of 261401415 in words is "two hundred sixty-one million, four hundred one thousand, four hundred fifteen".