90921769 has 4 divisors (see below), whose sum is σ = 92017296. Its totient is φ = 89826244.

The previous prime is 90921767. The next prime is 90921827. The reversal of 90921769 is 96712909.

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: 96712909 = 4621 ⋅20929.

It is a cyclic number.

It is not a de Polignac number, because 90921769 - 2¹ = 90921767 is a prime.

It is a super-2 number, since 2×90921769² = 16533536156178722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90921767) 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, 547639 + ... + 547804.

It is an arithmetic number, because the mean of its divisors is an integer number (23004324).

Almost surely, 2^90921769 is an apocalyptic number.

It is an amenable number.

90921769 is a deficient number, since it is larger than the sum of its proper divisors (1095527).

90921769 is a wasteful number, since it uses less digits than its factorization.

90921769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095526.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 90921769 is about 9535.2907139741. The cubic root of 90921769 is about 449.6652143664.

The spelling of 90921769 in words is "ninety million, nine hundred twenty-one thousand, seven hundred sixty-nine".