1551151969 has 2 divisors, whose sum is σ = 1551151970. Its totient is φ = 1551151968.

The previous prime is 1551151933. The next prime is 1551152011. The reversal of 1551151969 is 9691511551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1496761344 + 54390625 = 38688^2 + 7375^2 .

It is an emirp because it is prime and its reverse (9691511551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1551151969 - 2⁷ = 1551151841 is a prime.

It is a super-2 number, since 2×1551151969² = 4812144861865153922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1551151909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775575984 + 775575985.

It is an arithmetic number, because the mean of its divisors is an integer number (775575985).

Almost surely, 2^1551151969 is an apocalyptic number.

It is an amenable number.

1551151969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551151969 is an equidigital number, since it uses as much as digits as its factorization.

1551151969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60750, while the sum is 43.

The square root of 1551151969 is about 39384.6666737196. Note that the first 4 decimals coincide. The cubic root of 1551151969 is about 1157.5811589367.

The spelling of 1551151969 in words is "one billion, five hundred fifty-one million, one hundred fifty-one thousand, nine hundred sixty-nine".