401571979 has 2 divisors, whose sum is σ = 401571980. Its totient is φ = 401571978.

The previous prime is 401571941. The next prime is 401571997. The reversal of 401571979 is 979175104.

Together with next prime (401571997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401571979 - 2¹³ = 401563787 is a prime.

It is a super-2 number, since 2×401571979² = 322520108635952882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401572979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200785989 + 200785990.

It is an arithmetic number, because the mean of its divisors is an integer number (200785990).

Almost surely, 2^401571979 is an apocalyptic number.

401571979 is a deficient number, since it is larger than the sum of its proper divisors (1).

401571979 is an equidigital number, since it uses as much as digits as its factorization.

401571979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 43.

The square root of 401571979 is about 20039.2609394658. The cubic root of 401571979 is about 737.7702414405.

The spelling of 401571979 in words is "four hundred one million, five hundred seventy-one thousand, nine hundred seventy-nine".