261253036 has 36 divisors (see below), whose sum is σ = 514262056. Its totient is φ = 115980480.

The previous prime is 261253007. The next prime is 261253039. The reversal of 261253036 is 630352162.

It is a junction number, because it is equal to n+sod(n) for n = 261252995 and 261253013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261253039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14536 + ... + 27088.

Almost surely, 2^261253036 is an apocalyptic number.

It is an amenable number.

261253036 is a deficient number, since it is larger than the sum of its proper divisors (253009020).

261253036 is a wasteful number, since it uses less digits than its factorization.

261253036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12622 (or 12609 counting only the distinct ones).

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

The square root of 261253036 is about 16163.3237918443. The cubic root of 261253036 is about 639.2741086421.

It can be divided in two parts, 26125 and 3036, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 261253036 in words is "two hundred sixty-one million, two hundred fifty-three thousand, thirty-six".