157291217281 has 8 divisors (see below), whose sum is σ = 173657774304. Its totient is φ = 141269219520.

The previous prime is 157291217267. The next prime is 157291217323. The reversal of 157291217281 is 182712192751.

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

It is not a de Polignac number, because 157291217281 - 2¹⁷ = 157291086209 is a prime.

It is a super-2 number, since 2×157291217281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157291217201) 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, 86138856 + ... + 86140681.

It is an arithmetic number, because the mean of its divisors is an integer number (21707221788).

Almost surely, 2^157291217281 is an apocalyptic number.

157291217281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

157291217281 is a deficient number, since it is larger than the sum of its proper divisors (16366557023).

157291217281 is a wasteful number, since it uses less digits than its factorization.

157291217281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172279631.

The product of its digits is 141120, while the sum is 46.

The spelling of 157291217281 in words is "one hundred fifty-seven billion, two hundred ninety-one million, two hundred seventeen thousand, two hundred eighty-one".