947500690021 has 4 divisors (see below), whose sum is σ = 947902686732. Its totient is φ = 947098693312.

The previous prime is 947500689959. The next prime is 947500690061. The reversal of 947500690021 is 120096005749.

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 406961064225 + 540539625796 = 637935^2 + 735214^2 .

It is a cyclic number.

It is not a de Polignac number, because 947500690021 - 2²⁷ = 947366472293 is a prime.

It is a super-2 number, since 2×947500690021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 947500690021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947500690061) 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, 200994820 + ... + 200999533.

It is an arithmetic number, because the mean of its divisors is an integer number (236975671683).

Almost surely, 2^947500690021 is an apocalyptic number.

It is an amenable number.

947500690021 is a deficient number, since it is larger than the sum of its proper divisors (401996711).

947500690021 is a wasteful number, since it uses less digits than its factorization.

947500690021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401996710.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 947500690021 in words is "nine hundred forty-seven billion, five hundred million, six hundred ninety thousand, twenty-one".