90858121 has 4 divisors (see below), whose sum is σ = 90916612. Its totient is φ = 90799632.

The previous prime is 90858113. The next prime is 90858143. The reversal of 90858121 is 12185809.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15515721 + 75342400 = 3939^2 + 8680^2 .

It is a cyclic number.

It is not a de Polignac number, because 90858121 - 2³ = 90858113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90858101) 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, 26850 + ... + 30043.

It is an arithmetic number, because the mean of its divisors is an integer number (22729153).

Almost surely, 2^90858121 is an apocalyptic number.

It is an amenable number.

90858121 is a deficient number, since it is larger than the sum of its proper divisors (58491).

90858121 is a wasteful number, since it uses less digits than its factorization.

90858121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58490.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 90858121 is about 9531.9526331177. The cubic root of 90858121 is about 449.5602634369.

The spelling of 90858121 in words is "ninety million, eight hundred fifty-eight thousand, one hundred twenty-one".