1551340451 has 2 divisors, whose sum is σ = 1551340452. Its totient is φ = 1551340450.

The previous prime is 1551340387. The next prime is 1551340489. The reversal of 1551340451 is 1540431551.

It is a strong prime.

It is an emirp because it is prime and its reverse (1540431551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1551340451 - 2⁶ = 1551340387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551340751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775670225 + 775670226.

It is an arithmetic number, because the mean of its divisors is an integer number (775670226).

Almost surely, 2^1551340451 is an apocalyptic number.

1551340451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551340451 is an equidigital number, since it uses as much as digits as its factorization.

1551340451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 1551340451 is about 39387.0594358096. The cubic root of 1551340451 is about 1157.6280433125.

The spelling of 1551340451 in words is "one billion, five hundred fifty-one million, three hundred forty thousand, four hundred fifty-one".