261401315 has 16 divisors (see below), whose sum is σ = 361079040. Its totient is φ = 177953760.

The previous prime is 261401311. The next prime is 261401347. The reversal of 261401315 is 513104162.

It is not a de Polignac number, because 261401315 - 2² = 261401311 is a prime.

It is a super-4 number, since 4×261401315⁴ (a number of 35 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (261401311) 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, 22001 + ... + 31730.

It is an arithmetic number, because the mean of its divisors is an integer number (22567440).

Almost surely, 2^261401315 is an apocalyptic number.

261401315 is a deficient number, since it is larger than the sum of its proper divisors (99677725).

261401315 is a wasteful number, since it uses less digits than its factorization.

261401315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53882.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 261401315 is about 16167.9100380971. The cubic root of 261401315 is about 639.3950297221.

Adding to 261401315 its reverse (513104162), we get a palindrome (774505477).

The spelling of 261401315 in words is "two hundred sixty-one million, four hundred one thousand, three hundred fifteen".