88561421 has 4 divisors (see below), whose sum is σ = 95373852. Its totient is φ = 81748992.

The previous prime is 88561409. The next prime is 88561423. The reversal of 88561421 is 12416588.

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 38576521 + 49984900 = 6211^2 + 7070^2 .

It is a de Polignac number, because none of the positive numbers 2^k-88561421 is a prime.

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 (88561423) 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, 3406196 + ... + 3406221.

It is an arithmetic number, because the mean of its divisors is an integer number (23843463).

Almost surely, 2^88561421 is an apocalyptic number.

It is an amenable number.

88561421 is a deficient number, since it is larger than the sum of its proper divisors (6812431).

88561421 is a wasteful number, since it uses less digits than its factorization.

88561421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6812430.

The product of its digits is 15360, while the sum is 35.

The square root of 88561421 is about 9410.7077842211. The cubic root of 88561421 is about 445.7399145189.

The spelling of 88561421 in words is "eighty-eight million, five hundred sixty-one thousand, four hundred twenty-one".