158354981 has 4 divisors (see below), whose sum is σ = 159892512. Its totient is φ = 156817452.

The previous prime is 158354957. The next prime is 158355011. The reversal of 158354981 is 189453851.

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: 189453851 = 47 ⋅4030933.

It is a cyclic number.

It is not a de Polignac number, because 158354981 - 2²⁶ = 91246117 is a prime.

It is a super-2 number, since 2×158354981² = 50152600015020722, 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 (158354951) 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, 768611 + ... + 768816.

It is an arithmetic number, because the mean of its divisors is an integer number (39973128).

Almost surely, 2^158354981 is an apocalyptic number.

It is an amenable number.

158354981 is a deficient number, since it is larger than the sum of its proper divisors (1537531).

158354981 is a wasteful number, since it uses less digits than its factorization.

158354981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537530.

The product of its digits is 172800, while the sum is 44.

The square root of 158354981 is about 12583.9175537668. The cubic root of 158354981 is about 541.0165818231.

The spelling of 158354981 in words is "one hundred fifty-eight million, three hundred fifty-four thousand, nine hundred eighty-one".