25571621 has 8 divisors (see below), whose sum is σ = 27949824. Its totient is φ = 23290560.

The previous prime is 25571537. The next prime is 25571639. The reversal of 25571621 is 12617552.

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

It is a cyclic number.

It is not a de Polignac number, because 25571621 - 2¹⁴ = 25555237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25571671) 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, 23735 + ... + 24788.

It is an arithmetic number, because the mean of its divisors is an integer number (3493728).

Almost surely, 2^25571621 is an apocalyptic number.

It is an amenable number.

25571621 is a deficient number, since it is larger than the sum of its proper divisors (2378203).

25571621 is a wasteful number, since it uses less digits than its factorization.

25571621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48571.

The product of its digits is 4200, while the sum is 29.

The square root of 25571621 is about 5056.8390324391. The cubic root of 25571621 is about 294.6135742803.

The spelling of 25571621 in words is "twenty-five million, five hundred seventy-one thousand, six hundred twenty-one".