1215550151 has 4 divisors (see below), whose sum is σ = 1223600304. Its totient is φ = 1207500000.

The previous prime is 1215550121. The next prime is 1215550181. The reversal of 1215550151 is 1510555121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1510555121 = 281 ⋅5375641.

It is an interprime number because it is at equal distance from previous prime (1215550121) and next prime (1215550181).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215550151 is a prime.

It is a super-2 number, since 2×1215550151² = 2955124339192245602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215550151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215550121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4024850 + ... + 4025151.

It is an arithmetic number, because the mean of its divisors is an integer number (305900076).

Almost surely, 2^1215550151 is an apocalyptic number.

1215550151 is a deficient number, since it is larger than the sum of its proper divisors (8050153).

1215550151 is an equidigital number, since it uses as much as digits as its factorization.

1215550151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8050152.

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

The square root of 1215550151 is about 34864.7407992660. The cubic root of 1215550151 is about 1067.2290228806.

The spelling of 1215550151 in words is "one billion, two hundred fifteen million, five hundred fifty thousand, one hundred fifty-one".