235257981157 has 4 divisors (see below), whose sum is σ = 235259419756. Its totient is φ = 235256542560.

The previous prime is 235257981139. The next prime is 235257981197. The reversal of 235257981157 is 751189752532.

It is a Cunningham number, because it is equal to 485034²+1.

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 215216199396 + 20041781761 = 463914^2 + 141569^2 .

It is a cyclic number.

It is not a de Polignac number, because 235257981157 - 2⁷ = 235257981029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 235257981098 and 235257981107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (235257981197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437094 + ... + 813367.

It is an arithmetic number, because the mean of its divisors is an integer number (58814854939).

Almost surely, 2^235257981157 is an apocalyptic number.

It is an amenable number.

235257981157 is a deficient number, since it is larger than the sum of its proper divisors (1438599).

235257981157 is a wasteful number, since it uses less digits than its factorization.

235257981157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438598.

The product of its digits is 5292000, while the sum is 55.

The spelling of 235257981157 in words is "two hundred thirty-five billion, two hundred fifty-seven million, nine hundred eighty-one thousand, one hundred fifty-seven".