90949409 has 4 divisors (see below), whose sum is σ = 95736240. Its totient is φ = 86162580.

The previous prime is 90949379. The next prime is 90949421. The reversal of 90949409 is 90494909.

It is a happy number.

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: 90494909 = 2297 ⋅39397.

It is a cyclic number.

It is not a de Polignac number, because 90949409 - 2¹² = 90945313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90949409.

It is not an unprimeable number, because it can be changed into a prime (90949489) 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, 2393387 + ... + 2393424.

It is an arithmetic number, because the mean of its divisors is an integer number (23934060).

Almost surely, 2^90949409 is an apocalyptic number.

It is an amenable number.

90949409 is a deficient number, since it is larger than the sum of its proper divisors (4786831).

90949409 is a wasteful number, since it uses less digits than its factorization.

90949409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4786830.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 90949409 is about 9536.7399566099. The cubic root of 90949409 is about 449.7107754660.

The spelling of 90949409 in words is "ninety million, nine hundred forty-nine thousand, four hundred nine".