261157151 has 8 divisors (see below), whose sum is σ = 270886800. Its totient is φ = 251475840.

The previous prime is 261157081. The next prime is 261157153. The reversal of 261157151 is 151751162.

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

It is a cyclic number.

It is not a de Polignac number, because 261157151 - 2¹⁰ = 261156127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261157153) 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, 890 + ... + 22871.

It is an arithmetic number, because the mean of its divisors is an integer number (33860850).

Almost surely, 2^261157151 is an apocalyptic number.

261157151 is a deficient number, since it is larger than the sum of its proper divisors (9729649).

261157151 is a wasteful number, since it uses less digits than its factorization.

261157151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24169.

The product of its digits is 2100, while the sum is 29.

The square root of 261157151 is about 16160.3573908500. The cubic root of 261157151 is about 639.1958903505.

The spelling of 261157151 in words is "two hundred sixty-one million, one hundred fifty-seven thousand, one hundred fifty-one".