157220243 has 2 divisors, whose sum is σ = 157220244. Its totient is φ = 157220242.

The previous prime is 157220227. The next prime is 157220279. The reversal of 157220243 is 342022751.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157220243 - 2⁴ = 157220227 is a prime.

It is not a weakly prime, because it can be changed into another prime (157223243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78610121 + 78610122.

It is an arithmetic number, because the mean of its divisors is an integer number (78610122).

Almost surely, 2^157220243 is an apocalyptic number.

157220243 is a deficient number, since it is larger than the sum of its proper divisors (1).

157220243 is an equidigital number, since it uses as much as digits as its factorization.

157220243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 157220243 is about 12538.7496585585. The cubic root of 157220243 is about 539.7212129763.

Adding to 157220243 its reverse (342022751), we get a palindrome (499242994).

The spelling of 157220243 in words is "one hundred fifty-seven million, two hundred twenty thousand, two hundred forty-three".