81425049 has 8 divisors (see below), whose sum is σ = 111501120. Its totient is φ = 52816176.

The previous prime is 81425021. The next prime is 81425059. The reversal of 81425049 is 94052418.

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

It is not a de Polignac number, because 81425049 - 2⁵ = 81425017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81425059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366669 + ... + 366890.

It is an arithmetic number, because the mean of its divisors is an integer number (13937640).

Almost surely, 2^81425049 is an apocalyptic number.

It is an amenable number.

81425049 is a deficient number, since it is larger than the sum of its proper divisors (30076071).

81425049 is a wasteful number, since it uses less digits than its factorization.

81425049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733599.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 81425049 is about 9023.5829358410. The cubic root of 81425049 is about 433.4303742565.

The spelling of 81425049 in words is "eighty-one million, four hundred twenty-five thousand, forty-nine".