1511971 has 2 divisors, whose sum is σ = 1511972. Its totient is φ = 1511970.

The previous prime is 1511953. The next prime is 1511977. The reversal of 1511971 is 1791151.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1511971 - 2⁹ = 1511459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1511977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 755985 + 755986.

It is an arithmetic number, because the mean of its divisors is an integer number (755986).

2^1511971 is an apocalyptic number.

1511971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1511971 is an equidigital number, since it uses as much as digits as its factorization.

1511971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 315, while the sum is 25.

The square root of 1511971 is about 1229.6222997327. The cubic root of 1511971 is about 114.7751371653.

The spelling of 1511971 in words is "one million, five hundred eleven thousand, nine hundred seventy-one".