157212241 has 4 divisors (see below), whose sum is σ = 157341184. Its totient is φ = 157083300.

The previous prime is 157212239. The next prime is 157212269. The reversal of 157212241 is 142212751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 142212751 = 6389 ⋅22259.

It is a cyclic number.

It is not a de Polignac number, because 157212241 - 2¹ = 157212239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157212221) 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, 62625 + ... + 65086.

It is an arithmetic number, because the mean of its divisors is an integer number (39335296).

Almost surely, 2^157212241 is an apocalyptic number.

It is an amenable number.

157212241 is a deficient number, since it is larger than the sum of its proper divisors (128943).

157212241 is a wasteful number, since it uses less digits than its factorization.

157212241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128942.

The product of its digits is 1120, while the sum is 25.

The square root of 157212241 is about 12538.4305636710. The cubic root of 157212241 is about 539.7120561351.

Adding to 157212241 its reverse (142212751), we get a palindrome (299424992).

It can be divided in two parts, 15721224 and 1, that added together give a square (15721225 = 3965²).

The spelling of 157212241 in words is "one hundred fifty-seven million, two hundred twelve thousand, two hundred forty-one".