261147651 has 8 divisors (see below), whose sum is σ = 355605504. Its totient is φ = 170394120.

The previous prime is 261147637. The next prime is 261147661. The reversal of 261147651 is 156741162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-261147651 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (261147661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925915 + ... + 926196.

It is an arithmetic number, because the mean of its divisors is an integer number (44450688).

Almost surely, 2^261147651 is an apocalyptic number.

261147651 is a deficient number, since it is larger than the sum of its proper divisors (94457853).

261147651 is a wasteful number, since it uses less digits than its factorization.

261147651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852161.

The product of its digits is 10080, while the sum is 33.

The square root of 261147651 is about 16160.0634590338. The cubic root of 261147651 is about 639.1881396729.

The spelling of 261147651 in words is "two hundred sixty-one million, one hundred forty-seven thousand, six hundred fifty-one".