261201157 has 8 divisors (see below), whose sum is σ = 299044800. Its totient is φ = 223489824.

The previous prime is 261201131. The next prime is 261201163. The reversal of 261201157 is 751102162.

261201157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 261201157 - 2⁷ = 261201029 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 (261201197) 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, 28807 + ... + 36772.

It is an arithmetic number, because the mean of its divisors is an integer number (37380600).

Almost surely, 2^261201157 is an apocalyptic number.

It is an amenable number.

261201157 is a deficient number, since it is larger than the sum of its proper divisors (37843643).

261201157 is an equidigital number, since it uses as much as digits as its factorization.

261201157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66155.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 261201157 is about 16161.7188751692. The cubic root of 261201157 is about 639.2317906688.

The spelling of 261201157 in words is "two hundred sixty-one million, two hundred one thousand, one hundred fifty-seven".