261045430 has 32 divisors (see below), whose sum is σ = 477550080. Its totient is φ = 102727680.

The previous prime is 261045383. The next prime is 261045461. The reversal of 261045430 is 34540162.

It is a junction number, because it is equal to n+sod(n) for n = 261045395 and 261045404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184566 + ... + 185974.

It is an arithmetic number, because the mean of its divisors is an integer number (14923440).

Almost surely, 2^261045430 is an apocalyptic number.

261045430 is a deficient number, since it is larger than the sum of its proper divisors (216504650).

261045430 is a wasteful number, since it uses less digits than its factorization.

261045430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 261045430 is about 16156.9003834275. The cubic root of 261045430 is about 639.1047296715.

Adding to 261045430 its reverse (34540162), we get a palindrome (295585592).

It can be divided in two parts, 2610 and 45430, that multiplied together give a triangular number (118572300 = T₁₅₃₉₉).

The spelling of 261045430 in words is "two hundred sixty-one million, forty-five thousand, four hundred thirty".