157992649 has 4 divisors (see below), whose sum is σ = 158445700. Its totient is φ = 157539600.

The previous prime is 157992643. The next prime is 157992671. The reversal of 157992649 is 946299751.

157992649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946299751 = 271 ⋅3491881.

It can be written as a sum of positive squares in 2 ways, for example, as 118113424 + 39879225 = 10868^2 + 6315^2 .

It is a cyclic number.

It is not a de Polignac number, because 157992649 - 2³ = 157992641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 157992596 and 157992605.

It is not an unprimeable number, because it can be changed into a prime (157992641) 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, 226002 + ... + 226699.

It is an arithmetic number, because the mean of its divisors is an integer number (39611425).

Almost surely, 2^157992649 is an apocalyptic number.

It is an amenable number.

157992649 is a deficient number, since it is larger than the sum of its proper divisors (453051).

157992649 is an equidigital number, since it uses as much as digits as its factorization.

157992649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453050.

The product of its digits is 1224720, while the sum is 52.

The square root of 157992649 is about 12569.5126794956. The cubic root of 157992649 is about 540.6036333966.

The spelling of 157992649 in words is "one hundred fifty-seven million, nine hundred ninety-two thousand, six hundred forty-nine".