157223771 has 4 divisors (see below), whose sum is σ = 158780544. Its totient is φ = 155667000.

The previous prime is 157223753. The next prime is 157223777. The reversal of 157223771 is 177322751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177322751 = 173 ⋅1024987.

It is a cyclic number.

It is not a de Polignac number, because 157223771 - 2¹⁸ = 156961627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157223777) 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, 778235 + ... + 778436.

It is an arithmetic number, because the mean of its divisors is an integer number (39695136).

Almost surely, 2^157223771 is an apocalyptic number.

157223771 is a deficient number, since it is larger than the sum of its proper divisors (1556773).

157223771 is a wasteful number, since it uses less digits than its factorization.

157223771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556772.

The product of its digits is 20580, while the sum is 35.

The square root of 157223771 is about 12538.8903416530. The cubic root of 157223771 is about 539.7252500353.

The spelling of 157223771 in words is "one hundred fifty-seven million, two hundred twenty-three thousand, seven hundred seventy-one".