1971690481 has 16 divisors (see below), whose sum is σ = 2162026944. Its totient is φ = 1790659584.

The previous prime is 1971690463. The next prime is 1971690499. The reversal of 1971690481 is 1840961791.

It is an interprime number because it is at equal distance from previous prime (1971690463) and next prime (1971690499).

It is a cyclic number.

It is not a de Polignac number, because 1971690481 - 2⁹ = 1971689969 is a prime.

It is a super-2 number, since 2×1971690481² = 7775126705732022722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1971690421) 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, 44425 + ... + 76921.

It is an arithmetic number, because the mean of its divisors is an integer number (135126684).

Almost surely, 2^1971690481 is an apocalyptic number.

It is an amenable number.

1971690481 is a deficient number, since it is larger than the sum of its proper divisors (190336463).

1971690481 is a wasteful number, since it uses less digits than its factorization.

1971690481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32640.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 1971690481 is about 44403.7214769213. The cubic root of 1971690481 is about 1253.9481524909.

The spelling of 1971690481 in words is "one billion, nine hundred seventy-one million, six hundred ninety thousand, four hundred eighty-one".