157321741 has 4 divisors (see below), whose sum is σ = 158879484. Its totient is φ = 155764000.

The previous prime is 157321721. The next prime is 157321753. The reversal of 157321741 is 147123751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73599241 + 83722500 = 8579^2 + 9150^2 .

It is a cyclic number.

It is not a de Polignac number, because 157321741 - 2⁷ = 157321613 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157321721) 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, 778720 + ... + 778921.

It is an arithmetic number, because the mean of its divisors is an integer number (39719871).

Almost surely, 2^157321741 is an apocalyptic number.

It is an amenable number.

157321741 is a deficient number, since it is larger than the sum of its proper divisors (1557743).

157321741 is a wasteful number, since it uses less digits than its factorization.

157321741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557742.

The product of its digits is 5880, while the sum is 31.

The square root of 157321741 is about 12542.7963787985. The cubic root of 157321741 is about 539.8373321190.

The spelling of 157321741 in words is "one hundred fifty-seven million, three hundred twenty-one thousand, seven hundred forty-one".