13699531 has 4 divisors (see below), whose sum is σ = 13827672. Its totient is φ = 13571392.

The previous prime is 13699519. The next prime is 13699541. The reversal of 13699531 is 13599631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13599631 = 929 ⋅14639.

It is a cyclic number.

It is not a de Polignac number, because 13699531 - 2⁷ = 13699403 is a prime.

It is a super-2 number, since 2×13699531² = 375354299239922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13699541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63910 + ... + 64123.

It is an arithmetic number, because the mean of its divisors is an integer number (3456918).

Almost surely, 2^13699531 is an apocalyptic number.

13699531 is a deficient number, since it is larger than the sum of its proper divisors (128141).

13699531 is a wasteful number, since it uses less digits than its factorization.

13699531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128140.

The product of its digits is 21870, while the sum is 37.

The square root of 13699531 is about 3701.2877488788. The cubic root of 13699531 is about 239.2775205672.

It can be divided in two parts, 136995 and 31, that added together give a triangular number (137026 = T₅₂₃).

The spelling of 13699531 in words is "thirteen million, six hundred ninety-nine thousand, five hundred thirty-one".