158354921 has 4 divisors (see below), whose sum is σ = 160585344. Its totient is φ = 156124500.

The previous prime is 158354897. The next prime is 158354927. The reversal of 158354921 is 129453851.

It is a happy number.

158354921 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: 129453851 = 41 ⋅3157411.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158354921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158354927) 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, 1115105 + ... + 1115246.

It is an arithmetic number, because the mean of its divisors is an integer number (40146336).

Almost surely, 2^158354921 is an apocalyptic number.

It is an amenable number.

158354921 is a deficient number, since it is larger than the sum of its proper divisors (2230423).

158354921 is an equidigital number, since it uses as much as digits as its factorization.

158354921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230422.

The product of its digits is 43200, while the sum is 38.

The square root of 158354921 is about 12583.9151697713. The cubic root of 158354921 is about 541.0165134935.

The spelling of 158354921 in words is "one hundred fifty-eight million, three hundred fifty-four thousand, nine hundred twenty-one".