1971945615 has 16 divisors (see below), whose sum is σ = 3156408288. Its totient is φ = 1051272576.

The previous prime is 1971945593. The next prime is 1971945629. The reversal of 1971945615 is 5165491791.

It is not a de Polignac number, because 1971945615 - 2¹² = 1971941519 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12649 + ... + 64061.

It is an arithmetic number, because the mean of its divisors is an integer number (197275518).

Almost surely, 2^1971945615 is an apocalyptic number.

1971945615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1971945615 is a deficient number, since it is larger than the sum of its proper divisors (1184462673).

1971945615 is a wasteful number, since it uses less digits than its factorization.

1971945615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53978.

The product of its digits is 340200, while the sum is 48.

The square root of 1971945615 is about 44406.5942738238. The cubic root of 1971945615 is about 1254.0022365392.

The spelling of 1971945615 in words is "one billion, nine hundred seventy-one million, nine hundred forty-five thousand, six hundred fifteen".