261253630 has 16 divisors (see below), whose sum is σ = 513007344. Its totient is φ = 95001280.

The previous prime is 261253621. The next prime is 261253639. The reversal of 261253630 is 36352162.

It is an interprime number because it is at equal distance from previous prime (261253621) and next prime (261253639).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261253639) 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, 1187407 + ... + 1187626.

It is an arithmetic number, because the mean of its divisors is an integer number (32062959).

Almost surely, 2^261253630 is an apocalyptic number.

261253630 is a deficient number, since it is larger than the sum of its proper divisors (251753714).

261253630 is a wasteful number, since it uses less digits than its factorization.

261253630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375051.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 261253630 is about 16163.3421667674. The cubic root of 261253630 is about 639.2745931386.

The spelling of 261253630 in words is "two hundred sixty-one million, two hundred fifty-three thousand, six hundred thirty".