261352501 has 4 divisors (see below), whose sum is σ = 261457504. Its totient is φ = 261247500.

The previous prime is 261352499. The next prime is 261352589. The reversal of 261352501 is 105253162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261352501 - 2¹ = 261352499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261352601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48675 + ... + 53776.

It is an arithmetic number, because the mean of its divisors is an integer number (65364376).

Almost surely, 2^261352501 is an apocalyptic number.

It is an amenable number.

261352501 is a deficient number, since it is larger than the sum of its proper divisors (105003).

261352501 is a wasteful number, since it uses less digits than its factorization.

261352501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105002.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 261352501 is about 16166.4003723773. The cubic root of 261352501 is about 639.3552271016.

The spelling of 261352501 in words is "two hundred sixty-one million, three hundred fifty-two thousand, five hundred one".