93490781 has 4 divisors (see below), whose sum is σ = 95254812. Its totient is φ = 91726752.

The previous prime is 93490711. The next prime is 93490801. The reversal of 93490781 is 18709439.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32103556 + 61387225 = 5666^2 + 7835^2 .

It is a cyclic number.

It is not a de Polignac number, because 93490781 - 2¹⁴ = 93474397 is a prime.

It is a super-2 number, since 2×93490781² = 17481052263979922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (93490711) 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, 881936 + ... + 882041.

It is an arithmetic number, because the mean of its divisors is an integer number (23813703).

Almost surely, 2^93490781 is an apocalyptic number.

It is an amenable number.

93490781 is a deficient number, since it is larger than the sum of its proper divisors (1764031).

93490781 is a wasteful number, since it uses less digits than its factorization.

93490781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764030.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 93490781 is about 9669.0630880143. The cubic root of 93490781 is about 453.8610664426.

The spelling of 93490781 in words is "ninety-three million, four hundred ninety thousand, seven hundred eighty-one".