1215150551 has 2 divisors, whose sum is σ = 1215150552. Its totient is φ = 1215150550.

The previous prime is 1215150527. The next prime is 1215150613. The reversal of 1215150551 is 1550515121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1215150551 - 2¹⁰ = 1215149527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1215150551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215150511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607575275 + 607575276.

It is an arithmetic number, because the mean of its divisors is an integer number (607575276).

Almost surely, 2^1215150551 is an apocalyptic number.

1215150551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215150551 is an equidigital number, since it uses as much as digits as its factorization.

1215150551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1250, while the sum is 26.

The square root of 1215150551 is about 34859.0096101424. The cubic root of 1215150551 is about 1067.1120630942.

Adding to 1215150551 its reverse (1550515121), we get a palindrome (2765665672).

The spelling of 1215150551 in words is "one billion, two hundred fifteen million, one hundred fifty thousand, five hundred fifty-one".