90961538 has 4 divisors (see below), whose sum is σ = 136442310. Its totient is φ = 45480768.

The previous prime is 90961529. The next prime is 90961567. The reversal of 90961538 is 83516909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83516909 = 7 ⋅11930987.

It can be written as a sum of positive squares in only one way, i.e., 62520649 + 28440889 = 7907^2 + 5333^2 .

It is a junction number, because it is equal to n+sod(n) for n = 90961495 and 90961504.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22740383 + ... + 22740386.

Almost surely, 2^90961538 is an apocalyptic number.

90961538 is a deficient number, since it is larger than the sum of its proper divisors (45480772).

90961538 is a wasteful number, since it uses less digits than its factorization.

90961538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45480771.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 90961538 is about 9537.3758445392. The cubic root of 90961538 is about 449.7307656986.

The spelling of 90961538 in words is "ninety million, nine hundred sixty-one thousand, five hundred thirty-eight".