1291921151 has 2 divisors, whose sum is σ = 1291921152. Its totient is φ = 1291921150.

The previous prime is 1291921123. The next prime is 1291921153. The reversal of 1291921151 is 1511291921.

It is a strong prime.

It is an emirp because it is prime and its reverse (1511291921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1291921151 - 2¹⁴ = 1291904767 is a prime.

Together with 1291921153, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291921153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645960575 + 645960576.

It is an arithmetic number, because the mean of its divisors is an integer number (645960576).

Almost surely, 2^1291921151 is an apocalyptic number.

1291921151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291921151 is an equidigital number, since it uses as much as digits as its factorization.

1291921151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 32.

The square root of 1291921151 is about 35943.3046755581. The cubic root of 1291921151 is about 1089.1273634591.

The spelling of 1291921151 in words is "one billion, two hundred ninety-one million, nine hundred twenty-one thousand, one hundred fifty-one".