1158318421 has 8 divisors (see below), whose sum is σ = 1249620120. Its totient is φ = 1067331072.

The previous prime is 1158318397. The next prime is 1158318439. The reversal of 1158318421 is 1248138511.

It can be written as a sum of positive squares in 4 ways, for example, as 617796 + 1157700625 = 786^2 + 34025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1158318421 - 2⁵ = 1158318389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1158310421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70900 + ... + 85693.

It is an arithmetic number, because the mean of its divisors is an integer number (156202515).

Almost surely, 2^1158318421 is an apocalyptic number.

It is an amenable number.

1158318421 is a deficient number, since it is larger than the sum of its proper divisors (91301699).

1158318421 is a wasteful number, since it uses less digits than its factorization.

1158318421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157175.

The product of its digits is 7680, while the sum is 34.

The square root of 1158318421 is about 34034.0773490336. The cubic root of 1158318421 is about 1050.2096092494.

The spelling of 1158318421 in words is "one billion, one hundred fifty-eight million, three hundred eighteen thousand, four hundred twenty-one".