261152639 has 8 divisors (see below), whose sum is σ = 285271632. Its totient is φ = 237096640.

The previous prime is 261152629. The next prime is 261152681. The reversal of 261152639 is 936251162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261152639 - 2²⁴ = 244375423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261152599 and 261152608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261152629) 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, 6854 + ... + 23859.

It is an arithmetic number, because the mean of its divisors is an integer number (35658954).

Almost surely, 2^261152639 is an apocalyptic number.

261152639 is a deficient number, since it is larger than the sum of its proper divisors (24118993).

261152639 is a wasteful number, since it uses less digits than its factorization.

261152639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31497.

The product of its digits is 19440, while the sum is 35.

The square root of 261152639 is about 16160.2177893740. The cubic root of 261152639 is about 639.1922092100.

The spelling of 261152639 in words is "two hundred sixty-one million, one hundred fifty-two thousand, six hundred thirty-nine".