401698581 has 4 divisors (see below), whose sum is σ = 535598112. Its totient is φ = 267799052.

The previous prime is 401698579. The next prime is 401698601. The reversal of 401698581 is 185896104.

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 401698581 - 2¹ = 401698579 is a prime.

It is a super-2 number, since 2×401698581² = 322723499954827122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401698511) 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, 66949761 + ... + 66949766.

It is an arithmetic number, because the mean of its divisors is an integer number (133899528).

Almost surely, 2^401698581 is an apocalyptic number.

It is an amenable number.

401698581 is a deficient number, since it is larger than the sum of its proper divisors (133899531).

401698581 is a wasteful number, since it uses less digits than its factorization.

401698581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133899530.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 401698581 is about 20042.4195395666. The cubic root of 401698581 is about 737.8477645904.

The spelling of 401698581 in words is "four hundred one million, six hundred ninety-eight thousand, five hundred eighty-one".