261051363 has 16 divisors (see below), whose sum is σ = 392517760. Its totient is φ = 171435528.

The previous prime is 261051331. The next prime is 261051383. The reversal of 261051363 is 363150162.

It is not a de Polignac number, because 261051363 - 2⁵ = 261051331 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261051383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70345 + ... + 73962.

It is an arithmetic number, because the mean of its divisors is an integer number (24532360).

Almost surely, 2^261051363 is an apocalyptic number.

261051363 is a deficient number, since it is larger than the sum of its proper divisors (131466397).

261051363 is a wasteful number, since it uses less digits than its factorization.

261051363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144383 (or 144377 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 261051363 is about 16157.0839881459. The cubic root of 261051363 is about 639.1095714592.

The spelling of 261051363 in words is "two hundred sixty-one million, fifty-one thousand, three hundred sixty-three".