1210971451 has 4 divisors (see below), whose sum is σ = 1230823504. Its totient is φ = 1191119400.

The previous prime is 1210971439. The next prime is 1210971491. The reversal of 1210971451 is 1541790121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1541790121 = 367 ⋅4201063.

It is a cyclic number.

It is not a de Polignac number, because 1210971451 - 2¹⁵ = 1210938683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210971491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9925935 + ... + 9926056.

It is an arithmetic number, because the mean of its divisors is an integer number (307705876).

Almost surely, 2^1210971451 is an apocalyptic number.

1210971451 is a deficient number, since it is larger than the sum of its proper divisors (19852053).

1210971451 is an equidigital number, since it uses as much as digits as its factorization.

1210971451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19852052.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 1210971451 is about 34799.0150866372. The cubic root of 1210971451 is about 1065.8873341357.

The spelling of 1210971451 in words is "one billion, two hundred ten million, nine hundred seventy-one thousand, four hundred fifty-one".