13445971 has 32 divisors (see below), whose sum is σ = 17842176. Its totient is φ = 9828000.

The previous prime is 13445969. The next prime is 13446001. The reversal of 13445971 is 17954431.

13445971 = T₃₈₆ + T₃₈₇ + ... + T₅₁₆.

It is not a de Polignac number, because 13445971 - 2¹ = 13445969 is a prime.

It is a super-2 number, since 2×13445971² = 361588272265682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13445921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102576 + ... + 102706.

It is an arithmetic number, because the mean of its divisors is an integer number (557568).

Almost surely, 2^13445971 is an apocalyptic number.

13445971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13445971 is a deficient number, since it is larger than the sum of its proper divisors (4396205).

13445971 is a wasteful number, since it uses less digits than its factorization.

13445971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223.

The product of its digits is 15120, while the sum is 34.

The square root of 13445971 is about 3666.8748274246. The cubic root of 13445971 is about 237.7920823798.

The spelling of 13445971 in words is "thirteen million, four hundred forty-five thousand, nine hundred seventy-one".