157220233 has 4 divisors (see below), whose sum is σ = 166468500. Its totient is φ = 147971968.

The previous prime is 157220227. The next prime is 157220243. The reversal of 157220233 is 332022751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 332022751 = 8803 ⋅37717.

It can be written as a sum of positive squares in 2 ways, for example, as 141443449 + 15776784 = 11893^2 + 3972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157220233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 157220198 and 157220207.

It is not an unprimeable number, because it can be changed into a prime (157220243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4624108 + ... + 4624141.

It is an arithmetic number, because the mean of its divisors is an integer number (41617125).

Almost surely, 2^157220233 is an apocalyptic number.

It is an amenable number.

157220233 is a deficient number, since it is larger than the sum of its proper divisors (9248267).

157220233 is an equidigital number, since it uses as much as digits as its factorization.

157220233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9248266.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 157220233 is about 12538.7492597946. The cubic root of 157220233 is about 539.7212015333.

Adding to 157220233 its reverse (332022751), we get a palindrome (489242984).

The spelling of 157220233 in words is "one hundred fifty-seven million, two hundred twenty thousand, two hundred thirty-three".