81059402 has 8 divisors (see below), whose sum is σ = 122261412. Its totient is φ = 40305600.

The previous prime is 81059399. The next prime is 81059413. The reversal of 81059402 is 20495018.

It can be written as a sum of positive squares in 2 ways, for example, as 78340201 + 2719201 = 8851^2 + 1649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111599 + ... + 112322.

Almost surely, 2^81059402 is an apocalyptic number.

81059402 is a deficient number, since it is larger than the sum of its proper divisors (41202010).

81059402 is a wasteful number, since it uses less digits than its factorization.

81059402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224104.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 81059402 is about 9003.2995062921. The cubic root of 81059402 is about 432.7806137770.

The spelling of 81059402 in words is "eighty-one million, fifty-nine thousand, four hundred two".