261513345 has 32 divisors (see below), whose sum is σ = 424448640. Its totient is φ = 137479680.

The previous prime is 261513331. The next prime is 261513347. The reversal of 261513345 is 543315162.

It is not a de Polignac number, because 261513345 - 2⁵ = 261513313 is a prime.

It is a super-2 number, since 2×261513345² = 136778459226178050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261513347) 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, 501685 + ... + 502205.

It is an arithmetic number, because the mean of its divisors is an integer number (13264020).

Almost surely, 2^261513345 is an apocalyptic number.

It is an amenable number.

261513345 is a deficient number, since it is larger than the sum of its proper divisors (162935295).

261513345 is a wasteful number, since it uses less digits than its factorization.

261513345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945.

The product of its digits is 10800, while the sum is 30.

The square root of 261513345 is about 16171.3742458704. The cubic root of 261513345 is about 639.4863595285.

The spelling of 261513345 in words is "two hundred sixty-one million, five hundred thirteen thousand, three hundred forty-five".