1215738051 has 16 divisors (see below), whose sum is σ = 1872367488. Its totient is φ = 693468800.

The previous prime is 1215738037. The next prime is 1215738053. The reversal of 1215738051 is 1508375121.

It is a cyclic number.

It is not a de Polignac number, because 1215738051 - 2⁵ = 1215738019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1215738053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1082985 + ... + 1084106.

It is an arithmetic number, because the mean of its divisors is an integer number (117022968).

Almost surely, 2^1215738051 is an apocalyptic number.

1215738051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1215738051 is a deficient number, since it is larger than the sum of its proper divisors (656629437).

1215738051 is a wasteful number, since it uses less digits than its factorization.

1215738051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167122.

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 1215738051 is about 34867.4353946487. The cubic root of 1215738051 is about 1067.2840108768.

The spelling of 1215738051 in words is "one billion, two hundred fifteen million, seven hundred thirty-eight thousand, fifty-one".