1913039971 has 32 divisors (see below), whose sum is σ = 2146523328. Its totient is φ = 1697034240.

The previous prime is 1913039969. The next prime is 1913040001. The reversal of 1913039971 is 1799303191.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1913039971 - 2¹ = 1913039969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1913039671) 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, 2800596 + ... + 2801278.

It is an arithmetic number, because the mean of its divisors is an integer number (67078854).

Almost surely, 2^1913039971 is an apocalyptic number.

1913039971 is a deficient number, since it is larger than the sum of its proper divisors (233483357).

1913039971 is a wasteful number, since it uses less digits than its factorization.

1913039971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871.

The product of its (nonzero) digits is 45927, while the sum is 43.

The square root of 1913039971 is about 43738.3123931411. The cubic root of 1913039971 is about 1241.3893486906.

The spelling of 1913039971 in words is "one billion, nine hundred thirteen million, thirty-nine thousand, nine hundred seventy-one".