1915531 has 2 divisors, whose sum is σ = 1915532. Its totient is φ = 1915530.

The previous prime is 1915517. The next prime is 1915567. The reversal of 1915531 is 1355191.

It is a weak prime.

It is an emirp because it is prime and its reverse (1355191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1915531 - 2⁵ = 1915499 is a prime.

It is a super-2 number, since 2×1915531² = 7338518023922, which contains 22 as substring.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 1915496 and 1915505.

It is not a weakly prime, because it can be changed into another prime (1915591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 957765 + 957766.

It is an arithmetic number, because the mean of its divisors is an integer number (957766).

2^1915531 is an apocalyptic number.

1915531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1915531 is an equidigital number, since it uses as much as digits as its factorization.

1915531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 675, while the sum is 25.

The square root of 1915531 is about 1384.0270951105. The cubic root of 1915531 is about 124.1927932250.

The spelling of 1915531 in words is "one million, nine hundred fifteen thousand, five hundred thirty-one".