261045351 has 24 divisors (see below), whose sum is σ = 453614720. Its totient is φ = 141317136.

The previous prime is 261045349. The next prime is 261045371. The reversal of 261045351 is 153540162.

261045351 is a `hidden beast` number, since 2 + 610 + 45 + 3 + 5 + 1 = 666.

It is not a de Polignac number, because 261045351 - 2¹ = 261045349 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261045341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107845 + ... + 110238.

Almost surely, 2^261045351 is an apocalyptic number.

261045351 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

261045351 is a deficient number, since it is larger than the sum of its proper divisors (192569369).

261045351 is a wasteful number, since it uses less digits than its factorization.

261045351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218115 (or 218112 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 261045351 is about 16156.8979386515. The cubic root of 261045351 is about 639.1046652009.

It can be divided in two parts, 2610 and 45351, that added together give a square (47961 = 219²).

The spelling of 261045351 in words is "two hundred sixty-one million, forty-five thousand, three hundred fifty-one".