26191157 has 4 divisors (see below), whose sum is σ = 26300076. Its totient is φ = 26082240.

The previous prime is 26191129. The next prime is 26191183. The reversal of 26191157 is 75119162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22033636 + 4157521 = 4694^2 + 2039^2 .

It is a cyclic number.

It is not a de Polignac number, because 26191157 - 2⁶ = 26191093 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 (26191657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54098 + ... + 54579.

It is an arithmetic number, because the mean of its divisors is an integer number (6575019).

Almost surely, 2^26191157 is an apocalyptic number.

It is an amenable number.

26191157 is a deficient number, since it is larger than the sum of its proper divisors (108919).

26191157 is a wasteful number, since it uses less digits than its factorization.

26191157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108918.

The product of its digits is 3780, while the sum is 32.

The square root of 26191157 is about 5117.7296724231. The cubic root of 26191157 is about 296.9738628006.

The spelling of 26191157 in words is "twenty-six million, one hundred ninety-one thousand, one hundred fifty-seven".