90698121 has 6 divisors (see below), whose sum is σ = 131008410. Its totient is φ = 60465408.

The previous prime is 90698107. The next prime is 90698123. The reversal of 90698121 is 12189609.

It can be written as a sum of positive squares in only one way, i.e., 73359225 + 17338896 = 8565^2 + 4164^2 .

It is not a de Polignac number, because 90698121 - 2⁶ = 90698057 is a prime.

It is a super-2 number, since 2×90698121² = 16452298305861282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90698123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5038776 + ... + 5038793.

It is an arithmetic number, because the mean of its divisors is an integer number (21834735).

Almost surely, 2^90698121 is an apocalyptic number.

It is an amenable number.

90698121 is a deficient number, since it is larger than the sum of its proper divisors (40310289).

90698121 is a wasteful number, since it uses less digits than its factorization.

90698121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10077575 (or 10077572 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 90698121 is about 9523.5561110333. The cubic root of 90698121 is about 449.2962184067.

The spelling of 90698121 in words is "ninety million, six hundred ninety-eight thousand, one hundred twenty-one".