401021501 has 4 divisors (see below), whose sum is σ = 401061600. Its totient is φ = 400981404.

The previous prime is 401021461. The next prime is 401021557. The reversal of 401021501 is 105120104.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 401021501 - 2¹⁸ = 400759357 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 (401051501) 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, 8570 + ... + 29588.

It is an arithmetic number, because the mean of its divisors is an integer number (100265400).

Almost surely, 2^401021501 is an apocalyptic number.

It is an amenable number.

401021501 is a deficient number, since it is larger than the sum of its proper divisors (40099).

401021501 is a wasteful number, since it uses less digits than its factorization.

401021501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40098.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 401021501 is about 20025.5212416556. The cubic root of 401021501 is about 737.4329735505.

Adding to 401021501 its reverse (105120104), we get a palindrome (506141605).

The spelling of 401021501 in words is "four hundred one million, twenty-one thousand, five hundred one".