139814531 has 2 divisors, whose sum is σ = 139814532. Its totient is φ = 139814530.

The previous prime is 139814509. The next prime is 139814537. The reversal of 139814531 is 135418931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139814531 - 2¹⁴ = 139798147 is a prime.

It is a super-2 number, since 2×139814531² = 39096206157499922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139814491 and 139814500.

It is not a weakly prime, because it can be changed into another prime (139814537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69907265 + 69907266.

It is an arithmetic number, because the mean of its divisors is an integer number (69907266).

Almost surely, 2^139814531 is an apocalyptic number.

139814531 is a deficient number, since it is larger than the sum of its proper divisors (1).

139814531 is an equidigital number, since it uses as much as digits as its factorization.

139814531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The square root of 139814531 is about 11824.3194730183. The cubic root of 139814531 is about 519.0200120241.

The spelling of 139814531 in words is "one hundred thirty-nine million, eight hundred fourteen thousand, five hundred thirty-one".