1213170915 has 32 divisors (see below), whose sum is σ = 2242100736. Its totient is φ = 553602560.

The previous prime is 1213170913. The next prime is 1213170941. The reversal of 1213170915 is 5190713121.

It is not a de Polignac number, because 1213170915 - 2¹ = 1213170913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213170913) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 213447 + ... + 219056.

It is an arithmetic number, because the mean of its divisors is an integer number (70065648).

Almost surely, 2^1213170915 is an apocalyptic number.

1213170915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1213170915 is a deficient number, since it is larger than the sum of its proper divisors (1028929821).

1213170915 is a wasteful number, since it uses less digits than its factorization.

1213170915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432539.

The product of its (nonzero) digits is 1890, while the sum is 30.

The square root of 1213170915 is about 34830.6031386193. The cubic root of 1213170915 is about 1066.5322606798.

The spelling of 1213170915 in words is "one billion, two hundred thirteen million, one hundred seventy thousand, nine hundred fifteen".