43021590697 has 4 divisors (see below), whose sum is σ = 43023166420. Its totient is φ = 43020014976.

The previous prime is 43021590691. The next prime is 43021590721. The reversal of 43021590697 is 79609512034.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6722196121 + 36299394576 = 81989^2 + 190524^2 .

It is a cyclic number.

It is not a de Polignac number, because 43021590697 - 2³¹ = 40874107049 is a prime.

It is a super-2 number, since 2×43021590697² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43021590691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746172 + ... + 801757.

It is an arithmetic number, because the mean of its divisors is an integer number (10755791605).

Almost surely, 2^43021590697 is an apocalyptic number.

It is an amenable number.

43021590697 is a deficient number, since it is larger than the sum of its proper divisors (1575723).

43021590697 is a wasteful number, since it uses less digits than its factorization.

43021590697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575722.

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 43021590697 in words is "forty-three billion, twenty-one million, five hundred ninety thousand, six hundred ninety-seven".