401021549 has 4 divisors (see below), whose sum is σ = 413957760. Its totient is φ = 388085340.

The previous prime is 401021461. The next prime is 401021557. The reversal of 401021549 is 945120104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401021549 - 2¹² = 401017453 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 (401021149) 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, 6468059 + ... + 6468120.

It is an arithmetic number, because the mean of its divisors is an integer number (103489440).

Almost surely, 2^401021549 is an apocalyptic number.

It is an amenable number.

401021549 is a deficient number, since it is larger than the sum of its proper divisors (12936211).

401021549 is a wasteful number, since it uses less digits than its factorization.

401021549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12936210.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 401021549 is about 20025.5224401263. The cubic root of 401021549 is about 737.4330029726.

The spelling of 401021549 in words is "four hundred one million, twenty-one thousand, five hundred forty-nine".