90221697 has 24 divisors (see below), whose sum is σ = 137966400. Its totient is φ = 56716128.

The previous prime is 90221683. The next prime is 90221723. The reversal of 90221697 is 79612209.

It is not a de Polignac number, because 90221697 - 2¹² = 90217601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90221657) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7204 + ... + 15242.

It is an arithmetic number, because the mean of its divisors is an integer number (5748600).

Almost surely, 2^90221697 is an apocalyptic number.

It is an amenable number.

90221697 is a deficient number, since it is larger than the sum of its proper divisors (47744703).

90221697 is a wasteful number, since it uses less digits than its factorization.

90221697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8117 (or 8114 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 90221697 is about 9498.5102516131. The cubic root of 90221697 is about 448.5081410736.

The spelling of 90221697 in words is "ninety million, two hundred twenty-one thousand, six hundred ninety-seven".