158720101 has 4 divisors (see below), whose sum is σ = 159352704. Its totient is φ = 158087500.

The previous prime is 158720059. The next prime is 158720147. The reversal of 158720101 is 101027851.

158720101 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101027851 = 29 ⋅3483719.

It is a cyclic number.

It is not a de Polignac number, because 158720101 - 2¹⁹ = 158195813 is a prime.

It is a super-2 number, since 2×158720101² = 50384140922900402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158720201) 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, 315925 + ... + 316426.

It is an arithmetic number, because the mean of its divisors is an integer number (39838176).

Almost surely, 2^158720101 is an apocalyptic number.

It is an amenable number.

158720101 is a deficient number, since it is larger than the sum of its proper divisors (632603).

158720101 is an equidigital number, since it uses as much as digits as its factorization.

158720101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632602.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 158720101 is about 12598.4166068598. The cubic root of 158720101 is about 541.4320710136.

Adding to 158720101 its reverse (101027851), we get a palindrome (259747952).

The spelling of 158720101 in words is "one hundred fifty-eight million, seven hundred twenty thousand, one hundred one".